Service parts for the C50 N6H
Grouped by system, with how many of each the parts manual calls for.
Air intake
1 requiredOil system
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Fuel | natural gas or propane |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 50 kW |
| Standby kVA | 50 |
| Controller | PowerCommand (HMI211 operator), PowerCommand 1.1 |
| Oil capacity | 4.3 L |
| Alternator | Brushless, 2-pole rotating field, single bearing (2-pole) |
| Voltage options | 120/240 V, 120/208 V, 277/480 V |
| Phase | 1 or 3 |
| Battery group | ['26 standard', '34 high capacity'] |
| Battery cranking | [545, 850] CCA |
| Battery voltage | 12 V |
| Starting system | 12 V DC |
| Coolant capacity | 12.8 L |
| Max ambient | 50 °C |
| Dimensions (L×W×H) | 876×34×44 mm |
| Dry weight | 1750 kg |
| Wet weight | 1287 kg |
Engine
| Coolant capacity | 12.8 L |
|---|---|
| Displacement | 2.4 L |
| Aspiration | Naturally aspirated or turbocharged (varies by generator set model) |
| Rated speed | 1800 rpm |
Maintenance & consumables
for the Cummins/Onan QSJ2.4| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Preventive Maintenance Kit (Normal Duty Air Filter) | A046N987 | Amazon eBay | ||
| Fuel filter | Every 500 hours of operation or as needed, whichever comes first | — | 500 hr | ||
| Oil filter | Large, Oil Cooler | CA135-E12 | Amazon eBay | ||
| Battery | As needed | — | |||
| Oil | 500 miles or 6 months, whichever comes first | — | 804 hr | ||
| Spark plug | C20 N6 (Spec A), C22 N6 (Spec A), C25 N6 (Spec A), C30 N6 (Spec A), C36 N6 (Spec A), C40 N6 (Spec A), C45 N6 (Spec A), C50 N6H (Spec A), C60 N6H (Spec A) | — | 1200 hr |
Service intervals
30| Item | Action | Hours | Months | Notes |
|---|---|---|---|---|
| Air cleaner restriction indicator (where fitted) | Check | 24 hr | Daily or after 24 hours, whichever occurs first. If indicator shows red, replace air cleaner elements and reset indicator. | |
| Air intake system | Inspect | 24 hr | Daily or after 24 hours. Visually and audibly check for leaks, wear or damage. | |
| Batteries - connections secure and battery area clear | Check | 24 hr | Daily or after 24 hours and Weekly or after 50 hours. | |
| Coolant level of radiator(s) (water jacket & LTA) | Check | 24 hr | Daily or after 24 hours. Top up with Cummins recommended coolant mix if low. | |
| Engine oil level | Check | 24 hr | Daily or after 24 hours. Top up to engine specifications level with recommended oil. | |
| Exhaust components and hardware (fittings, clamps, fasteners) | Inspect | 24 hr | Daily or after 24 hours and Weekly or after 50 hours. Visually and audibly inspect for wear or damage. | |
| Generator set enclosure | Check | 24 hr | Daily or after 24 hours. Walk-around inspection; ensure no inlets/outlets restricted and safety systems in place. | |
| Operator panel | Check | 24 hr | Daily or after 24 hours. Replace component if not functioning properly. | |
| Battery condition | Check | 50 hr | Weekly or after 50 hours. | |
| Charge alternator | Check | 50 hr | Weekly or after 50 hours. Check visually and audibly when generator set is running. | |
| Coolant lines and radiator hoses | Check | 50 hr | 12 mo | Weekly or after 50 hours and 12 Months or after 200 Hours. Check for leaks, wear and cracks. |
| Cooling fan blades | Inspect | 50 hr | Weekly or after 50 hours. Visually inspect for wear or damage. | |
| Drive belt, condition and tension | Check | 50 hr | Weekly or after 50 hours. Check for wear or slippage. | |
| Emergency Stop Button (where fitted) | Test | 50 hr | Weekly or after 50 hours. With generator set running, press Emergency Stop button. | |
| Fuel lines and hoses | Check | 50 hr | Weekly or after 50 hours. Visually check for leaks, wear or damage. | |
| Radiator air flow | Inspect | 50 hr | Weekly or after 50 hours. Check for blockage, debris, wear or damage. | |
| Air cleaner | Replace | 100 hr | Replace air cleaner. | |
| Aftercooler core (where fitted) | Check | 200 hr | 12 mo | 12 Months or after 200 Hours. |
| Coolant heater (where fitted) | Check | 200 hr | 12 mo | 12 Months or after 200 Hours. Check it has power and is running. |
| Electrical connections (battery, starter motor and alternator connections) | Check | 200 hr | 12 mo | 12 Months or after 200 Hours. |
| Engine ground | Check | 200 hr | 12 mo | 12 Months or after 200 Hours. Clean as necessary. |
| Engine mounts | Check | 200 hr | 12 mo | 12 Months or after 200 Hours. |
| Engine oil and filters | Replace | 200 hr | 12 mo | First service — After the initial 50 hour interval and every 200 hours thereafter; 12 Months or after 200 Hours. |
| Radiator core | Clean | 200 hr | 12 mo | 12 Months or after 200 Hours. Cleaning schedule may be reduced depending on operating conditions/environment. |
| Spark plugs | Inspect | 200 hr | 12 mo | 12 Months or after 200 Hours. Replace as necessary. |
| Starting motor | Check | 200 hr | 12 mo | 12 Months or after 200 Hours. |
| Timing belt condition | Inspect | 200 hr | 12 mo | 12 Months or after 200 Hours. Visually inspect. |
| Turbocharger (where fitted) | Check | 200 hr | 12 mo | 12 Months or after 200 Hours. |
| Water pump | Check | 200 hr | 12 mo | 12 Months or after 200 Hours. |
| Cooling system coolant | Replace | 24 mo | 2 Years. |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Service specifications
10| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Gap | Spark plug gap (NA) | 0.040 | inch (1.0 mm) | |
| Gap | Spark plug gap (T/TAA) | 0.030 | inch (0.76 mm) | |
| Other | Maximum I2 (negative sequence) | 8 | % | |
| Pressure | Engine oil pressure low (shutdown) threshold - Code 415 | 26 | psig (180 kPa) | for greater than 10 seconds |
| Resistance | Engine harness pin resistance (ECM to sensor) - Code 5569 diagnosis | 5 ohms or less | ohms | |
| Speed | Endurance run period (normal duty air cleaner test) | 30 | seconds | after oil/filter change, run then shut off and wait 5 minutes |
| Temperature | Engine coolant temperature above normal (warning) - Code 146 | 225 | °F (107.2 °C) | for greater than 5 seconds |
| Temperature | Intake manifold temperature high (shutdown) - Code 155 | 203 | °F (95 °C) | for greater than 10 seconds |
| Temperature | Intake manifold temperature high (warning) - Code 488 | 185 | °F (85 °C) | for more than 90 seconds |
| Torque | Spark plug torque | 15 | ft-lb (20 N-m) |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Recommended fluids
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|---|---|---|---|---|
| Coolant | Cummins recommended coolant mix | Top up coolant system to specifications level with Cummins recommended coolant mix. For NFPA 110 applications a coolant heater is required. | |||
| Engine oil | 5W30 API SM | API SM | 4.3 L | Approximately 4.5 quarts (4.3 L). Dipstick High mark 4.3 L (4.5 qt), Low mark 3.8 L (4.0 qt). | |
| Fuel | Natural gas or propane vapor | Fuel pressure 6-14 inch water column. |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Fault codes
13| Code | Name | Meaning | Severity | Action |
|---|---|---|---|---|
| 143 | Engine Oil Pressure Low | Engine oil pressure is below the low oil pressure warning threshold. | Warning | Check the oil level and add oil if necessary. Inspect the engine and surrounding area for external oil leaks; contact your local dealer if a leak is present. |
| 146 | Engine Coolant Temperature Above Normal | Engine coolant temperature has exceeded 225 °F (107.2 °C) for greater than 5 seconds. | Warning | Reduce loads or recirculation of discharge air in elevated ambient; inspect/clear enclosure air intake and discharge blockage; check and add coolant; clean the radiator core; inspect and replace a broken fan belt. |
| 151 | Engine Coolant Temperature High | Engine coolant temperature has exceeded the alarm (shutdown) threshold for high coolant temperature. | Shutdown | Reduce loads or recirculation of discharge air in elevated ambient; clear enclosure air intake and discharge blockage; check and add coolant; clean the radiator core; inspect and replace a broken fan belt. |
| 155 | Intake Manifold Temperature High | Engine intake manifold temperature has exceeded 203 °F (95 °C) for greater than 10 seconds. | Shutdown | Reduce loads or recirculation of discharge air in elevated ambient; clear enclosure air intake and discharge blockage; check and add coolant; clean the radiator core; inspect and replace a broken fan belt. |
| 197 | Coolant Level Low | Coolant level sensor signal is showing a low coolant level for greater than 10 seconds. | Warning | Remove radiator cap and check that coolant is up to the required level. |
| 415 | Engine Oil Pressure Low | Engine oil pressure is below 26 psig (180 kPa) for greater than 10 seconds. | Shutdown | Check the oil level and add oil if necessary. Inspect the engine and surrounding area for external oil leaks; contact your local dealer if a leak is present. |
| 421 | Engine Oil Temperature High | The control has detected the engine oil temperature has exceeded the warning threshold. | Warning | Reduce loads or recirculation of discharge air in elevated ambient; inspect/clear enclosure air intake blockage; check and add coolant. |
| 441 | Battery Voltage Low | Battery voltage low. | Warning | Inspect the battery cable connections for corrosion and for loose connections. |
| 488 | Intake Manifold Temperature High | Engine intake manifold temperature has exceeded 185 °F (85 °C) for more than 90 seconds. | Warning | Reduce loads or recirculation of discharge air in elevated ambient; clear enclosure air intake and discharge blockage; check and add coolant; clean the radiator core; inspect and replace a broken fan belt. |
| 1438 | Fail to Crank | The engine failed to crank after the generator control received a start signal. | Shutdown | Verify battery voltage is at least 12 VDC. Charge or replace the battery as necessary. |
| 1472 | High AC Current | The generator output current has exceeded at least 150% of rated current. | Shutdown | Reduce the generator set load by powering off unnecessary household appliances. |
| 5134 | Unknown Shutdown at Idle | The generator set failed to start. | Shutdown | Check that the manual shutoff valves are open (fuel supply issue). |
| 5569 | Engine Combustion | Rapid rate of increase of intake manifold temperature detected. | Shutdown | Inspect hose couplings between compressor outlet and intake manifold; inspect the turbocharger; inspect the mixer; check the TMAP sensor value with GCP Display service tool or InPower; inspect the engine harness and connector pins (resistance should be 5 ohms or less) and repair or replace as necessary. |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Procedures
11Check the fault log diagnostic
- From any Information Menu, hold down the up and down arrows simultaneously for two seconds to access the Service Menu.
- Select Fault History.
- Active faults are displayed first, followed by Fault History screens newest to oldest.
Adding oil maintenance
⚠ Too much oil can cause high oil consumption. Too little oil can cause severe engine damage.
⚠ Hot engines can burn you. Ensure that the generator set engine has cooled down before adding or draining the oil.
- Ensure that the oil fill cap area is clean, and prevent debris from entering the engine.
- Add the appropriate amount of oil, based on the engine oil level check performed beforehand.
- Recheck the engine oil level. Based on the results, add or drain oil.
- Clean up and dispose of any oil in accordance with local/state regulations.
Air cleaner element removal and installation (Heavy Duty) maintenance
- Wipe dirt from the cover and upper portion of the air cleaner.
- Lift tab and turn end cover counter clockwise.
- Pull the end cover away from the housing.
- Remove the media from the housing.
- To install: insert the media into the housing, install the end cover onto the housing, turn clockwise until the latch snaps into place.
Air cleaner removal and installation (Normal Duty) maintenance
⚠ Holes, loose-end seals, dented sealing surfaces, corrosion of pipes render the air cleaner inoperative and require immediate element replacement.
- Loosen the strap clamp.
- Wipe away debris around the air cleaner connection to the engine.
- Remove the dirty cleaner and dispose of the dirty element per local requirements.
- To install: install the air cleaner and tighten the strap clamp.
Changing engine oil and oil filter maintenance
⚠ Used engine oil can be carcinogenic and cause reproductive toxicity. Avoid inhalation, ingestion, and prolonged contact.
⚠ Avoid direct contact of hot oil with your skin.
- Operate the engine until the water temperature is approximately 60 °C (140 °F).
- Shut down the engine.
- Drain the oil.
- Remove the oil filter and clean the filter mounting surface; remove the old gasket if it remains.
- Make sure the gasket is in place on the new filter, apply a thin film of clean oil to the gasket, install until the gasket just touches the block, then turn an additional 1/2 to 3/4 turn.
- Refill with oil until full.
- Start and run for 30 seconds.
- Shut the engine off and wait 5 minutes.
- Check the engine oil level.
- Dispose of the used oil and oil filter according to local environmental regulations.
Check the engine oil level maintenance
⚠ Crankcase pressure can blow out hot oil and cause severe burns. Do NOT check oil while the engine is operating.
- Pull out the dipstick and wipe it clean.
- Clean off the area surrounding the dipstick port to prevent entry of debris into the oil pan.
- Make sure that the engine has not been running for approximately five minutes.
- Reinsert and fully seat the dipstick.
- Remove the dipstick and check the oil level.
- Reinsert and fully seat the dipstick.
Draining oil maintenance
⚠ Ensure that the generator set engine has cooled down before adding or draining the oil.
- Detach the oil drain hose from the side of the engine.
- Place the end of the drain hose into an appropriate container.
- Open the oil drain valve to release oil from the engine into the container.
- Recheck the engine oil level. Based on results, add or drain oil.
- Close the oil drain valve, wipe it clean, and re-attach the drain hose.
- Dispose of the used oil in accordance with local/state regulations.
Exercise settings - update exercise frequency operation
- Press Exercise Schdr on the Daylight Saving Adjust End Menu.
- Press Adjust.
- Use + or - keys to edit Schdr Enable, Exercise Schedule, and Day/Hours/Minutes/AM-PM.
- Press Save to save any changes.
Screen brightness and contrast adjustment operation
- From any Information screen, hold down the up and down arrows simultaneously for two seconds to access the Service Menu screen.
- Select Screen Adjust.
- Select Adjust to access the screen variables.
- Press the right arrow to move between variables.
- Adjust settings, and press Save to save any changes.
Set up the clock (Time Setup) operation
⚠ When battery power is lost, these settings must be reset.
- Access the Time Setup Menu by selecting Clock Exerciser on the Genset Service Menu.
- Select Adjust.
- Use the right arrow to select blocks and + or - keys to adjust values.
- Press Save to save any changes.
Update exercise duration operation
- Press the down key on the Exercise Schdr Menu.
- Press Adjust.
- Use the horizontal right arrow key to select the duration block.
- Use the + or - keys to edit the exercise duration minutes.
- Press Save to save any changes.
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Common questions
What is the power rating of the Cummins/Onan C50 N6H?
The Cummins/Onan C50 N6H is rated 50 kW standby (50.0 kVA).
What engine does the Cummins/Onan C50 N6H use?
The Cummins/Onan C50 N6H is powered by the Cummins/Onan QSJ2.4 engine.
What fuel type does the Cummins/Onan C50 N6H take?
The Cummins/Onan C50 N6H runs on natural gas or propane.
What is the coolant capacity of the Cummins/Onan C50 N6H?
The Cummins/Onan C50 N6H cooling system holds 12.8 liters (3.4 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.
What is the oil capacity of the Cummins/Onan C50 N6H?
The Cummins/Onan C50 N6H has an engine oil capacity of 4.3 liters (4.5 US quarts), per the manufacturer specification sheet.
What is the dry weight of the Cummins/Onan C50 N6H?
The Cummins/Onan C50 N6H has a dry weight of 1750 kg (3858 lb).
What voltages is the Cummins/Onan C50 N6H available in?
The Cummins/Onan C50 N6H is offered in 120/240 V, 120/208 V, 277/480 V, 1 or 3-phase.
How many cold cranking amps does the Cummins/Onan C50 N6H require?
The Cummins/Onan C50 N6H uses 12 V each, [545, 850] CCA, group ['26 standard', '34 high capacity'], per the manufacturer specification sheet. The starting system is 12 V DC.
What alternator does the Cummins/Onan C50 N6H use?
The Cummins/Onan C50 N6H uses a Brushless, 2-pole rotating field, single bearing alternator. It has 2 poles.
What oil filter fits the Cummins/Onan C50 N6H?
The Cummins/Onan C50 N6H uses oil filter part number CA135-E12.
What air filter does the Cummins/Onan C50 N6H use?
The Cummins/Onan C50 N6H uses air filter part number A046N987.
Troubleshooting
75Fault codes
| Code | Meaning | Cause | Remedy |
|---|---|---|---|
| 143 | Engine Oil Pressure Low (Warning) — Engine oil pressure is below the low oil pressure warning threshold. | Lubricating oil level is low | Check the oil level. Add oil, if necessary. |
| 143 | Engine Oil Pressure Low (Warning) — Engine oil pressure is below the low oil pressure warning threshold. | External leak | Inspect the engine and surrounding area for external oil leaks; Contact your local dealer if a leak is present. |
| 151 | Engine Coolant Temperature High (Shutdown) — Engine coolant temperature has exceeded the alarm (shutdown) threshold for high coolant temperature. | High ambient temperature | Reduce loads or recirculation of discharge air to generator in elevated ambient. |
| 151 | Engine Coolant Temperature High (Shutdown) — Engine coolant temperature has exceeded the alarm (shutdown) threshold for high coolant temperature. | Enclosure air intake blocked | Inspect for dirt, debris, or obstructions; Remove blockage or snow/ice buildup as applicable. |
| 151 | Engine Coolant Temperature High (Shutdown) — Engine coolant temperature has exceeded the alarm (shutdown) threshold for high coolant temperature. | Coolant level is below specification | Check coolant level; Add coolant as necessary |
| 151 | Engine Coolant Temperature High (Shutdown) — Engine coolant temperature has exceeded the alarm (shutdown) threshold for high coolant temperature. | Radiator blocked | Inspect for dirt, debris, or obstruction; Remove blockage or winterfront as applicable. |
| 151 | Engine Coolant Temperature High (Shutdown) — Engine coolant temperature has exceeded the alarm (shutdown) threshold for high coolant temperature. | Enclosure air discharge blocked | Inspect for dirt, debris, or obstructions; Remove blockage or snow/ice buildup as applicable. |
| 151 | Engine Coolant Temperature High (Shutdown) — Engine coolant temperature has exceeded the alarm (shutdown) threshold for high coolant temperature. | Fan belt is broken or loose | Inspect belt(s) for damage, wear, and proper tension; Repair or replace if damaged or worn. |
| 155 | Intake Manifold Temperature High (Shutdown) — Engine intake manifold temperature has exceeded 203 °F (95 °C) for greater than 10 seconds. | For the troubleshooting procedure, refer to DTC 127 in the E-Controls Manual. | |
| 197 | Coolant Level Low (Warning) — Coolant level sensor signal is showing a low coolant level for greater 10 seconds. | Low coolant | Remove radiator cap and check that coolant is up to the required level. |
| 415 | Engine Oil Pressure Low (Shutdown) — Engine oil pressure is below 26 psig (180 kpa) for greater than 10 seconds. | Lubricating oil level is low | Check the oil level. Add oil, if necessary. |
| 415 | Engine Oil Pressure Low (Shutdown) — Engine oil pressure is below 26 psig (180 kpa) for greater than 10 seconds. | External leak | Inspect the engine and surrounding area for external oil leaks; Contact your local dealer if a leak is present. |
| 421 | Engine Oil Temperature High (Warning) — The control has detected the engine oil temperature has exceeded the warning threshold. | High ambient temperature | Reduce loads or recirculation of discharge air to generator in elevated ambient. |
| 421 | Engine Oil Temperature High (Warning) — The control has detected the engine oil temperature has exceeded the warning threshold. | Enclosure air intake blocked | Inspect for dirt, debris, or obstructions; Remove blockage or snow/ice buildup as applicable. |
| 421 | Engine Oil Temperature High (Warning) — The control has detected the engine oil temperature has exceeded the warning threshold. | Coolant level is below specification | Check coolant level; Add coolant as necessary. |
| 441 | Battery Voltage Low (Warning) — Battery voltage is low. | Loose or damaged battery cable connections | Inspect the battery cable connections; Inspect connections for corrosion; Inspect connections for loose connections. |
| 441 | Battery Voltage Low (Warning) — Battery voltage is low. | Battery charger not connected (if equipped) | Make sure that the battery charger is connected to the AC power supply; Make sure that the battery charger is connected correctly to the battery. |
| 441 | Battery Voltage Low (Warning) — Battery voltage is low. | Battery needs recharging | Using a voltmeter or multimeter, determine if the voltage is below 11 V. If so, recharge the battery. |
| 488 | Intake Manifold Temperature High (Warning) — Engine intake manifold temperature has exceeded 185 °F (85 °C) for more than 90 seconds. | High ambient temperature | Reduce loads or recirculation of discharge air to generator in elevated ambient. |
| 488 | Intake Manifold Temperature High (Warning) — Engine intake manifold temperature has exceeded 185 °F (85 °C) for more than 90 seconds. | Enclosure air intake blocked | Inspect for dirt, debris, or obstructions; Remove blockage or snow/ice buildup as applicable. |
| 488 | Intake Manifold Temperature High (Warning) — Engine intake manifold temperature has exceeded 185 °F (85 °C) for more than 90 seconds. | Coolant level is below specification | Check coolant level; Add coolant as necessary. |
| 488 | Intake Manifold Temperature High (Warning) — Engine intake manifold temperature has exceeded 185 °F (85 °C) for more than 90 seconds. | Radiator blocked | Inspect for dirt, debris or obstructions; Remove blockage or winterfront as applicable. |
| 488 | Intake Manifold Temperature High (Warning) — Engine intake manifold temperature has exceeded 185 °F (85 °C) for more than 90 seconds. | Enclosure air discharge blocked | Inspect for dirt, debris, or obstructions; Remove blockage or snow/ice buildup as applicable. |
| 488 | Intake Manifold Temperature High (Warning) — Engine intake manifold temperature has exceeded 185 °F (85 °C) for more than 90 seconds. | Fan belt is broken or loose | Inspect belt(s) for damage, wear, and proper tension; Repair or replace if damaged or worn. |
| 1438 | Fail to Crank (Shutdown) — The engine failed to crank after the generator control received a start signal. | Dead or weak battery | Verify battery voltage is at least 12 VDC (or 24 VDC if applicable); Charge or replace the battery as necessary. |
| 1438 | Fail to Crank (Shutdown) — The engine failed to crank after the generator control received a start signal. | Failed starter | Press the Reset/Fault acknowledge button on the display; Attempt to start the generator and test for B+ at the starter supply lug; If B+ is present at the starter supply lug, the starter could be defective. |
| 1472 | High AC Current (Shutdown) — The generator output current has exceeded at least 150% of rated current. | Generator set overload | Reduce the generator set load by powering off to unnecessary household appliances (examples: washer, dryer, air conditioning, etc.). |
| 5134 | Unknown Shutdown at Idle — Engine is not getting a proper fuel supply. | Fuel supply issue | Check that there is a proper supply of fuel to the engine. |
| 143 | Engine Oil Pressure Low (Warning) | Lubricating oil level is low | Check the oil level. Add oil, if necessary |
| 143 | Engine Oil Pressure Low (Warning) | External leak | Inspect the engine and surrounding area for external oil leaks; Contact your local dealer if a leak is present |
| 146 | Engine Coolant Temperature Above Normal (Warning) | High ambient temperature | Reduce loads or recirculation of discharge air to generator in elevated ambient |
| 146 | Engine Coolant Temperature Above Normal (Warning) | Enclosure air intake blocked | Inspect for dirt, debris, or obstructions; Remove blockage or snow/ice buildup as applicable |
| 146 | Engine Coolant Temperature Above Normal (Warning) | Coolant level is below specification | Check coolant level; Add coolant as necessary |
| 146 | Engine Coolant Temperature Above Normal (Warning) | Radiator core fouled | Inspect for dirt, debris, or obstruction on core; Remove obstructions or debris, and clean the radiator core |
| 146 | Engine Coolant Temperature Above Normal (Warning) | Enclosure air discharge blocked | Inspect for dirt, debris, or obstructions; Remove blockage or snow/ice buildup as applicable |
| 146 | Engine Coolant Temperature Above Normal (Warning) | Broken fan belt | Inspect fan belt; Replace fan belt |
| 151 | Engine Coolant Temperature High (Shutdown) | High ambient temperature | Reduce loads or recirculation of discharge air to generator in elevated ambient |
| 151 | Engine Coolant Temperature High (Shutdown) | Enclosure air intake blocked | Inspect for dirt, debris, or obstructions; Remove blockage or snow/ice buildup as applicable |
| 151 | Engine Coolant Temperature High (Shutdown) | Coolant level is below specification | Check coolant level; Add coolant as necessary |
| 151 | Engine Coolant Temperature High (Shutdown) | Radiator core fouled | Inspect for dirt, debris, or obstruction on core; Remove obstructions or debris, and clean the radiator core |
| 151 | Engine Coolant Temperature High (Shutdown) | Enclosure air discharge blocked | Inspect for dirt, debris, or obstructions; Remove blockage or snow/ice buildup as applicable |
| 151 | Engine Coolant Temperature High (Shutdown) | Broken fan belt | Inspect fan belt; Replace fan belt |
| 155 | Intake Manifold Temperature High (Shutdown) | High ambient temperature | Reduce loads or recirculation of discharge air to generator in elevated ambient |
| 155 | Intake Manifold Temperature High (Shutdown) | Enclosure air intake blocked | Inspect for dirt, debris, or obstructions; Remove blockage or snow/ice buildup as applicable |
| 155 | Intake Manifold Temperature High (Shutdown) | Coolant level is below specification | Check coolant level; Add coolant as necessary |
| 155 | Intake Manifold Temperature High (Shutdown) | Radiator core fouled | Inspect for dirt, debris, or obstruction on core; Remove obstructions or debris, and clean the radiator core |
| 155 | Intake Manifold Temperature High (Shutdown) | Enclosure air discharge blocked | Inspect for dirt, debris, or obstructions; Remove blockage or snow/ice buildup as applicable |
| 155 | Intake Manifold Temperature High (Shutdown) | Broken fan belt | Inspect fan belt; Replace fan belt |
| 197 | Coolant Level Low (Warning) | Low coolant | Remove radiator cap and check that coolant is up to the required level |
| 415 | Engine Oil Pressure Low (Shutdown) | Lubricating oil level is low | Check the oil level. Add oil, if necessary |
| 415 | Engine Oil Pressure Low (Shutdown) | External leak | Inspect the engine and surrounding area for external oil leaks; Contact your local dealer if a leak is present |
| 421 | Engine Oil Temperature High (Warning) | High ambient temperature | Reduce loads or recirculation of discharge air to generator in elevated ambient |
| 421 | Engine Oil Temperature High (Warning) | Enclosure air intake blocked | Inspect for dirt, debris, or obstructions; Remove blockage or snow/ice buildup as applicable |
| 421 | Engine Oil Temperature High (Warning) | Coolant level is below specification | Check coolant level; Add coolant as necessary |
| 441 | Battery Voltage Low (Warning) | Loose or damaged battery cable connections | Inspect the battery cable connections; Inspect connections for corrosion; Inspect connections for loose connections |
| 488 | Intake Manifold Temperature High (Warning) | High ambient temperature | Reduce loads or recirculation of discharge air to generator in elevated ambient |
| 488 | Intake Manifold Temperature High (Warning) | Enclosure air intake blocked | Inspect for dirt, debris, or obstructions; Remove blockage or snow/ice buildup as applicable |
| 488 | Intake Manifold Temperature High (Warning) | Coolant level is below specification | Check coolant level; Add coolant as necessary |
| 488 | Intake Manifold Temperature High (Warning) | Radiator core fouled | Inspect for dirt, debris, or obstruction on core; Remove obstructions or debris, and clean the radiator core |
| 488 | Intake Manifold Temperature High (Warning) | Enclosure air discharge blocked | Inspect for dirt, debris, or obstructions; Remove blockage or snow/ice buildup as applicable |
| 488 | Intake Manifold Temperature High (Warning) | Broken fan belt | Inspect fan belt; Replace fan belt |
| 1438 | Fail to Crank (Shutdown) | Dead or weak battery | Verify battery voltage is at least 12 VDC; Charge or replace the battery as necessary |
| 1472 | High AC Current (Shutdown) | Generator set overload | Reduce the generator set load by powering off to unneccessary household appliances (examples: washer, dryer, air conditioning, etc.) |
| 5134 | Unknown Shutdown at Idle | Fuel supply issue | Check that the manual shutoff valves are open |
| 5569 | Engine Combustion (Shutdown) | Intake manifold overpressurization event | Inspect the hose couplings between the compressor outlet and intake manifold; Inspect the hose couplings for damage; Inspect the clamps for damage; Inspect the turbocharger; Externally inspect the turbocharger for damage; Inspect for loose or missing bolts on the compressor housing; Inspect the mixer; Remove the air cleaner and confirm there are no loose pieces within the mixer |
| 5569 | Engine Combustion (Shutdown) | Faulty TMAP sensor | Check the intake air temperature with the GCP Display service tool or the intake manifold temperature with InPower. Confirm that the value is reasonable |
| 5569 | Engine Combustion (Shutdown) | Faulty engine harness | Inspect the engine harness and the connector pins; Disconnect the engine harness connector from the extension harness; Inspect for corroded pins, bent or broken pins, pushed back or expanded pins; Inspect for evidence of moisture in or on the connector; Inspect for missing or damaged connector seals; Inspect for dirt or debris in or on the connector pin; Disconnect harness from ECM and sensor; Measure the resistance in each pin from ECM to sensor. Resistance should be 5 ohms or less; Repair or replace harness as necessary |
| Code 143 | Engine Oil Pressure Low (Warning) | ||
| Code 146 | Engine Coolant Temperature Above Normal (Warning) | ||
| Code 151 | Engine Coolant Temperature High (Shutdown) |
Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| Engine Is Difficult to Start or Does Not Start | Battery voltage problem(s) | If battery voltage is low, interrupted, or open, check: Battery connections; Unswitched battery supply circuit; Fuses |
| Engine Is Difficult to Start or Does Not Start | Fuel system issue(s) | Verify that the manual fuel shutoff valve is open. |
| Engine Is Difficult to Start or Does Not Start | Air intake restriction above specification | Inspect air filter for obstruction. Replace if necessary. |
| Engine is Difficult to Start or Does Not Start | Battery voltage is low, interrupted, or open | Check the batteries connections, unswitched battery supply circuit, and fuses |
| Engine is Difficult to Start or Does Not Start | Manual fuel shutoff valve is closed | Check the manual fuel shutoff valves |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Repair guides
9- Air cleaner element removal and installation (Heavy Duty)
- Air cleaner removal and installation (Normal Duty)
- Check the engine oil level
- Check the fault log
- Draining oil
- Exercise settings - update exercise frequency
- Screen brightness and contrast adjustment
- Set up the clock (Time Setup)
- Update exercise duration
Step-by-step procedures compiled from the Cummins/Onan service manual for this model.
Parts
13| Part # | Description | Qty | System | |
|---|---|---|---|---|
| A046N983 | Preventive Maintenance Kit –Heavy Duty | 2 | Air filter | Amazon eBay |
| A046N985 | Preventive Maintenance Kit (Normal Duty Air Filter) | 2 | Air filter | Amazon eBay |
| A046N987 | Preventive Maintenance Kit (Normal Duty Air Filter) | 2 | Air filter | Amazon eBay |
| CA115-T12 | Large, Oil Cooler | Oil filter | Amazon eBay | |
| CA135-E12 | Large, Oil Cooler | Oil filter | Amazon eBay | |
| A046J612 | Base Barrier – Elevated Genset | 1 | Service part / kit | Amazon eBay |
| A046L270 | Instruction Sheet | 1 | Service part / kit | Amazon eBay |
| CA115-H14 | Small | Service part / kit | Amazon eBay | |
| CA115-J12 | Small | Service part / kit | Amazon eBay | |
| CA115-L14 | Small | Service part / kit | Amazon eBay | |
| CA115-M12 | Large | Service part / kit | Amazon eBay | |
| CA115-P12 | Large | Service part / kit | Amazon eBay | |
| CA115-R12 | Large | Service part / kit | Amazon eBay |
Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.
Available documents
Spec sheet — NAS-5706-EN (Cummins/Onan)Operator's manual — 2929 rx powerconnect operatormanual (Cummins/Onan)Parts manual — 77789-1301Service manual — 8023 rx powerconnect installmanual (Cummins/Onan)Service manual — C30N6 Service Manual (Cummins/Onan)Service manual — QSJ2.6 Generator Set Operator Manual (Cummins/Onan)Service manual — cummins-rs30-208-owners-manual (Cummins/Onan)
This page was generated from the 7 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.