Cummins/Onan GSAA troubleshooting: 21 fault codes and 11 symptom-cause-remedy entries from the manufacturer's own service documentation.
Cummins/Onan GSAA — full specs, parts & maintenance.
All Cummins/Onan fault codes →
| Code | Meaning | Cause | Remedy |
|---|---|---|---|
| 2 | Low Oil Pressure Fault | Oil Level too low/high, faulty switch, faulty oil pressure relief valve, faulty oil pump | Check oil level: add or drain oil as necessary. |
| 4 | Overcrank | First−level shutdown code – Cranking exceeded 30 seconds after 3rd cycle crank. | Open any closed fuel valves; Secure spark plug leads to spark plugs; Check and service air filter as necessary; Replace spark plugs. |
| 12 | Overvoltage | Controller unable to maintain rated voltage. | Have unit serviced by an authorized Cummins Onan dealer. |
| 13 | Undervoltage | Controller unable to maintain rated voltage. | Have unit serviced by an authorized Cummins Onan dealer. |
| 14 | Overfrequency | Engine governor unable to maintain rated frequency. | Have unit serviced by an authorized Cummins Onan dealer. |
| 15 | Underfrequency | Engine governor unable to maintain rated frequency. | Reduce the number of connected loads especially loads that require higher starting current such as air conditioners; Have unit serviced by an authorized Cummins Onan dealer. |
| 19 | Governor Actuator shutdown | Controller sensed governor actuator circuit open or shorted. | Have unit serviced by an authorized Cummins Onan dealer. |
| 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. |
| 27 | Voltage Sense Lost | Control unable to sense output voltage | Have unit serviced by an authorized Cummins Onan dealer. |
| 29 | High Battery Voltage | Voltage across battery system is greater than 19 volts | Have battery charger serviced by an authorized Cummins Onan dealer. |
| 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. |
| 35 | Control Card Failure | Microprocessor EEPROM error during self−test. | Have unit serviced by an authorized Cummins Onan dealer. |
| 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. |
| 37 | Invalid Set Configuration | Wrong frequency / rpm ratio. | Have unit serviced by an authorized Cummins Onan dealer. |
| 43 | Processor Fault | Microprocessor RAM error during self−test. | Have unit serviced by an authorized Cummins Onan dealer. |
| 45 | Speed Sense Fault | Controller unable to sense quadrature frequency. | Have unit serviced by an authorized Cummins Onan dealer. |
| 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. |
| 76 | Alternator Over Temp | Temperature at generator alternator is greater than 170°F [76°C]. | Have unit serviced by an authorized Cummins Onan dealer. |
| 78 | Low Fuel Pressure | Controller sensing fuel pressure switch closed. | Open any closed fuel valves; Have unit serviced by an authorized Cummins Onan dealer. |
| 79 | Failure To Transfer To Generator Set | Controller unable to sense transfer switch position in standby power position. | Verify that the main AC circuit breaker on the generator set is to "On"; Have unit serviced by an authorized Cummins Onan dealer. |
| CODE 19 | Controller sensed governor actuator circuit open or shorted. | Have unit serviced by an authorized Cummins Onan dealer. |
| Symptom | Cause | Remedy |
|---|---|---|
| No Response — Status Indicator Light Dead | Low/No battery voltage, poor battery connection, faulty battery, open harness connection, faulty start/stop switch, faulty LED | Try generator set Start Switch if the remote display Start Switch does not respond, and vice versa; Clean and tighten positive (+) and negative (−) battery cable connections at the battery; Recharge or replace battery. Refer to the battery manufacturer's recommendations. |
| Starting Battery Runs Down | Marginal battery connections, battery, charging system, excessive cranking | Clean and tighten positive (+) and negative (−) battery cable connections at the battery; Recharge or replace battery. Refer to the battery manufacturer's recommendations; Have battery charger serviced by an authorized Cummins location. |
| Starter Engages − Disengages | Cranking voltage dips below 6 VDC − Battery connections, battery, charging system, start/stop switches | Clean and tighten positive (+) and negative (−) battery cable connections at the battery; Recharge or replace battery. Refer to the battery manufacturer's recommendations; Have the battery charger serviced by an authorized Cummins Onan dealer. |
| No AC Power − generator set Running, Status LED On Steady or Flashing Rapidly | Circuit breakers tripped to OFF, due to short circuit or overloading. | Reset or turn on generator set circuit breaker; Reset or turn on circuit breaker in the distribution panel; Reduce number of loads; Have the circuits from the generator set and distribution panel verified by an authorized electrician. |
| Generator Set Cranks But Does Not Start − No Fault Code | Not holding start switch long enough to cause fault | Check and record last fault code; 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 | Check and record last fault code; 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. |
| Genset Warning-Transfer Switch Failed to Transfer to Utility − No Fault Code | Transfer switch is faulty, or wire is disconnected or broken | Have the utility switch-position wire, wire connections, and transfer switch checked by an authorized electrician. |
| Genset Warning-Transfer Switch Signal Failure − No Fault Code | Broken wire connections, or transfer switch stuck in neutral position. | Have the utility switch-position wire, wire connections, and transfer switch checked by an authorized electrician. |
| In-Home Network Access to Generator Set Troubleshooting | Bad connections or bad communications | Check connections: Verify that the Ethernet cable is plugged into the generator set control and the router; Verify that the computer is connected to the same router as the generator set via an Ethernet cable; Verify that the wireless card on the computer is turned off; Check to see if both ends of the Ethernet cable are assembled and crimped as described in the installation instructions. If not, reassemble and crimp as described in the installation instructions; Verify that the Ethernet cable connections between the generator set and the router are solid and correct; Proceed to "Check communications."; Check communications: Check to see if you can access a standard web page with the computer connected to the same router as the generator set. If not, contact your router manufacturer for troubleshooting information; Check to see if the green and orange lights are illuminated at the Ethernet connection port on the generator set control board. If not, disconnect the Ethernet cable from the generator control board and connect it to the computer. Check to see if you can access a standard web page with the computer connected to the generator side of the Ethernet cable. If you can access a standard web page, call Cummins Support at 1-800-888-6626 and select option 1. If you cannot access a standard web page, go to "Check connections" above; Check to see if the correct generator IP address has been entered, as described in step 3 (page C-2) of the Network Setup Guide (i.e. http://xxx.xxx.xxx.xxx). If not, enter the correct IP address; Check to see if you can access the generator set via the in-home network. If not, call Cummins Support at 1-800-888-6626 and select option 1. |
| Remote internet access to generator set troubleshooting | An improper setup; no high-speed internet connection; the public IP address is not active or properly set up; an incorrect IP address is entered; the computer is connect to the same router or network and the generator set; the internet connection is bad | Check to see if you are able to access the generator set with your in-home computer. If not, refer to the "In-home Network Access Troubleshooting" procedures; Verify that you followed the network setup procedures. Refer to the Network Setup Guide in Appendix C; Verify that you are using a high-speed internet connection; Verify that the public IP address is active and set up properly with the ISP (Internet Service Provider). If necessary, contact the ISP to verify your setup; Verify that the correct public IP address is entered into the web browser of the computer (i.e. xxx.xxx.xxx.xxx); Verify that the computer is not connected to the same router or network as the generator set. The computer used for internet access must be connect to a different internet connection than the generator set; Check to see if you can access a standard web page from a computer. If not, contact the ISP to troubleshoot the internet connection; Verify all settings, as described in the Network Setup Guide; If the previous steps do not correct the problem, contact a computer network specialist to diagnose |
| Email alert troubleshooting | An improper setup; the alert level is not set to "all events"; emails cannot be received; the outgoing email address is not included in your contact list; the email account is not capable of using port 25 with plain SMTP for the outgoing SMTP server setup; the domain name is not included in the user name filed of the Network Setup screen; the DNS #1 and #2 values are incorrect on the Network Setup screen | Check to see if you are able to access the generator set with your in-home computer. If not, refer to "In-Home Computer Access Troubleshooting"; Verify that you followed the network setup instructions. Refer to the Network Setup Guide in Appendix C; Verify that the alert level is set to "All Events". To verify that your generator set can send emails, select "Disable Standby" and wait several minutes to verify that you did receive an email. Then select "Enable Standby" and wait a few more minutes to verify that you did receive a second email; Send an email to the destination email address and check to see if you received this email. If not, contact your email service provider or your ISP (internet service provider) to diagnose; Check to see if the destination email accounts have spam filtering. If spam filtering is present, add the outgoing email address to your contact list. If spam filtering is not present, proceed to step 6; Check to see if you are using an email account capable of using port 25 with plain authentication SMTP server setup. If necessary, obtain an email account capable of using port 25 with plain authentication SMTP and enter detail into the network setup screen; Verify that the domain name is included in the user name field of the Network Setup screen (i.e. username@domainname); Verify with your ISP that the Static DNS (Domain Name Server) #1 and #2 are correct; If the previous steps do not correct the problem, contact a computer network specialist to diagnose |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: Low/No battery voltage, poor battery connection, faulty battery, open harness connection, faulty start/stop switch, faulty LED. See the table for the matching fixes.
Documented causes: Marginal battery connections, battery, charging system, excessive cranking. See the table for the matching fixes.
Documented causes: Cranking voltage dips below 6 VDC − Battery connections, battery, charging system, start/stop switches. See the table for the matching fixes.