The Transfer Switch is a generator-set controller. It is used on generator sets from Cummins/Onan, including the 13GSBA-6712, 14GSBB, 20GSBB and 20GSBB-6714.
Also fitted to: Cummins/Onan 14GSBB-6716A/B, Cummins/Onan 20GSBB-6713A/B.
| Code | Meaning | Cause | Remedy |
|---|---|---|---|
| 12 | Overvoltage | ||
| 12 | Overvoltage - Fault Code 12 | ||
| 13 | Undervoltage | ||
| 13 | Undervoltage - Fault Code 13 | ||
| 14 | Overfrequency | ||
| 14 | Overfrequency - Fault Code 14 | ||
| 15 | Underfrequency | ||
| 15 | Underfrequency - Fault Code 15 | ||
| 19 | Governor Actuator Shutdown | ||
| 19 | Governor Actuator shutdown | ||
| 19 | Governor Actuator shutdown - Fault Code 19 | ||
| 2 | Low Oil Pressure Fault | ||
| 2 | No AC Power - generator set Running, Status LED On Steady or Flashing | ||
| 22 | GOVERNOR ACTUATOR OVERLOAD | Duration of operation at or near full duty−cycle beyond design limit | Reduce the number of connected loads especially loads that require higher starting current such as air conditioners. Check and service air filter as necessary. Have unit serviced by an authorized Cummins Onan dealer. |
| 22 | Governor Actuator Overload | ||
| 22 | Governor Actuator Overload - Fault Code 22 | ||
| 27 | VOLTAGE SENSE LOST | Control unable to sense output voltage | Have unit serviced by an authorized Cummins Onan dealer. |
| 27 | Voltage Sense Lost | ||
| 27 | Voltage Sense Lost - Fault Code 27 | ||
| 29 | High Battery Voltage | ||
| 29 | High Battery Voltage - Fault Code 29 | ||
| 3 | Service Check Fault | ||
| 32 | LOW CRANKING SPEED SENSE | Controller sensed generator set cranking speed less than 180 rpm for greater than 3 seconds. | Clean and tighten positive (+) and negative (−) battery cable connections at the battery. Recharge or replace battery. Refer to the battery manufacturer’s recommendations. Verify engine oil viscosity is correct for the ambient temperature. If not, refill and replace engine oil with correct viscosity. Have unit serviced by an authorized Cummins Onan dealer. |
| 32 | Low Cranking Speed Sense | ||
| 32 | Low Cranking Speed Sense - Fault Code 32 | ||
| 35 | Control Card Failure | ||
| 35 | Control Card Failure - Fault Code 35 | ||
| 36 | GENERATOR SET STOPPED WITHOUT FAULT CONDITION | Generator stopped without command by controller. | Open any closed fuel valves. Secure spark plug leads to spark plugs. Check and service air filter as necessary. Replace spark plugs. Check for mechanical damage. |
| 36 | Generator Set Stopped Without Fault Condition | ||
| 36 | Generator Set Stopped Without Fault Condition - Fault Code 36 | ||
| 37 | Invalid Set Configuration | ||
| 37 | Invalid Set Configuration - Fault Code 37 | ||
| 4 | Overcrank | ||
| 43 | Processor Fault | ||
| 43 | Processor Fault - Fault Code 43 | ||
| 45 | SPEED SENSE FAULT | Controller unable to sense quadrature frequency. | Have unit serviced by an authorized Cummins Onan dealer. |
| 45 | Speed Sense Fault | ||
| 45 | Speed Sense Fault - Fault Code 45 | ||
| 46 | GENERATOR SET OVERLOAD | Current is at 100% of rated operation at design limit. | Reduce the number of connected loads especially loads that require higher starting current such as air conditioners. Check and service air filter as necessary. Have unit serviced by an authorized Cummins Onan dealer. |
| 46 | Generator Set Overload | ||
| 76 | Alternator Over Temp | ||
| 78 | Low Fuel Pressure | ||
| 79 | Failure To Transfer To Generator Set | ||
| CODE 19 | Controller sensed governor actuator circuit open or shorted. | Have unit serviced by an authorized Cummins Onan dealer. | |
| Code 143 | Engine Oil Pressure Low (Warning) | ||
| Code 146 | Engine Coolant Temperature Above Normal (Warning) | ||
| Code 151 | Engine Coolant Temperature High (Shutdown) |
| Symptom | Cause | Remedy |
|---|---|---|
| Failure To Transfer To Generator Set - Fault Code 79 | ||
| No AC Power - generator set Running, Status LED On Steady or Flashing Rapidly | ||
| Any spillage that occurs during fueling or during oil top-off or oil change must be cleaned up before starting the generator set. | Clean up any spillage before starting the generator set. | |
| Fire Hazard | Contaminated insulation is a fire hazard. | Remove any contaminated insulation and dispose of it in accordance with local regulations. |
| GENERATOR SET CRANKS BUT DOES NOT START − NO FAULT CODE | Not holding start switch long enough to cause fault | 1. Check and record last fault code. 2. Crank generator set and hold switch until control stops cranking and displays fault code (approximately 30 seconds): troubleshoot fault code and reference last fault code recorded above if necessary. |
| GENERATOR SET RUNS BUT STOPS WHEN SWITCH IS RELEASED − NO FAULT CODE | Not holding start switch long enough to cause fault | 1. Check and record last fault code. 2. Start generator set and hold switch until control shuts down and displays fault code (approximately 30 seconds): troubleshoot fault code and reference last fault code recorded above if necessary. |
| Generator Set Cranks But Does Not Start - No Fault Code | Faulty or incorrect spark plugs. | 1. Check and record last fault code. 2. Crank generator set and troubleshoot fault code and reference last fault code recorded above if necessary. |
| Genset Warning-Transfer Switch Failed to Transfer to Utility - No Fault Code | Transfer switch is faulty, or wire is disconnected or broken | 1. Have the utility switch-position wire, wire connections, and transfer switch checked by an authorized electrician. |
| NO AC POWER − GENERATOR SET RUNNING, STATUS LED ON STEADY OR FLASHING RAPIDLY | Circuit breakers tripped to OFF, due to short circuit or overloading. | 1. Reset or turn on generator set circuit breaker. 2. Reset or turn on circuit breaker in the distribution panel. 3. Reduce number of loads. 4. Have the circuits from the generator set and distribution panel verified by an authorized electrician. |
| NO RESPONSE − STATUS INDICATOR LIGHT DEAD | Low/No battery voltage, poor battery connection, faulty battery, open harness connection, faulty start/stop switch, faulty LED | 1. Try generator set Start Switch if the remote display Start Switch does not respond, and vice versa 2. Clean and tighten positive (+) and negative (−) battery cable connections at the battery. 3. Recharge or replace battery. Refer to the battery manufacturer’s recommendations. |
| Rcuit or overloading | 1. Reduce number of loads. 2. Reset or turn on generator set circuit breaker. 3. Reset or turn on circuit breaker in the distribution panel. 4. Have the circuits from the generator set and distribution panel verified by an authorized electrician. | |
| STARTER ENGAGES − DISENGAGES | Cranking voltage dips below 6 VDC − Battery connections, battery, charging system, start/stop switches | 1. Clean and tighten positive (+) and negative (−) battery cable connections at the battery. 2. Recharge or replace battery. Refer to the battery manufacturer’s recommendations. 3. Have the battery charger serviced by an authorized Cummins Onan dealer. |
| STARTING BATTERY RUNS DOWN | Marginal battery connections, battery, charging system, excessive cranking | 1. Clean and tighten positive (+) and negative (−) battery cable connections at the battery. 2. Recharge or replace battery. Refer to the battery manufacturer’s recommendations. 3. Have battery charger serviced by an authorized Cummins location. |
Fault codes and symptom→remedy steps extracted from this controller’s service/owner documentation; verify against the official manual before servicing. Aggregated from the service documentation of generator sets built on this controller.