Service parts for the C45 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 | 45 kW |
| Standby kVA | 45 |
| 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 | 1624 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 |
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 C45 N6H?
The Cummins/Onan C45 N6H is rated 45 kW standby (45.0 kVA).
What engine does the Cummins/Onan C45 N6H use?
The Cummins/Onan C45 N6H is powered by the Cummins/Onan QSJ2.4 engine.
What fuel does the Cummins/Onan C45 N6H use?
The Cummins/Onan C45 N6H runs on natural gas or propane.
What is the coolant capacity of the Cummins/Onan C45 N6H?
The Cummins/Onan C45 N6H cooling system holds 12.8 liters (3.4 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.
How much oil does the Cummins/Onan C45 N6H take?
The Cummins/Onan C45 N6H has an engine oil capacity of 4.3 liters (4.5 US quarts), per the manufacturer specification sheet.
How much does the Cummins/Onan C45 N6H weigh?
The Cummins/Onan C45 N6H has a dry weight of 1624 kg (3580 lb).
What voltages is the Cummins/Onan C45 N6H available in?
The Cummins/Onan C45 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 C45 N6H require?
The Cummins/Onan C45 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.
Which alternator is fitted to the Cummins/Onan C45 N6H?
The Cummins/Onan C45 N6H uses a Brushless, 2-pole rotating field, single bearing alternator. It has 2 poles.
Which oil filter part number does the Cummins/Onan C45 N6H take?
The Cummins/Onan C45 N6H uses oil filter part number CA135-E12.
What air filter does the Cummins/Onan C45 N6H use?
The Cummins/Onan C45 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 — 77789-1301Parts manual — NAACSB-6026-EN (Cummins/Onan)Service 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 8 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.