Owner`s manual

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Troubleshooting Guide
Under normal operating conditions, you can expect your Cummins Onan generator
to perform reliably without problems. But if a problem does occur you may be able
to isolate the cause by using the following troubleshooting chart.
If you cannot discover and correct the problem, make a note of your generator
model and serial numbers and contact your local Cummins Onan Authorized RV
Service and Parts Dealer. RV QD generators have a unique control system. Consult
your RV QD Owner’s Manual for troubleshooting information.
Trouble Shooting Guide
Problem Probable Cause Solution
Fails To
Crank
1. Low battery. 1. Check battery fluid level.
2. Bad battery connection. 2. Clean & tighten all battery & cable connections.
3. Blown fuse. 3. Replace fuse on control panel.
Cranks
Slowly
1. Low battery. 1. Check battery fluid level.
2. Bad battery connection. 2. Clean & tighten all battery & cable connections.
3. Incorrect oil viscosity. 3. Replace with recommended viscosity oil.
4. Load connected. 4. Disconnect load before starting.
Cranks But
Won’t Start
1. Fuel below generator pickup level in tank. 1. Add fuel.
2. Fuel supply shutoff valve closed. 2. Fully open fuel supply valve.
3. Carbon deposits on spark plug(s). 3. Remove spark plug(s) and replace.
4. Low oil level. 4. Add oil.
Exhausting
Black Smoke
1. Dirty air filter. 1. Replace air filter.
2. Choke stuck or misadjusted. 2. Contact an Cummins Onan Authorized RV Service & Parts Dealer.
Unit Runs Then
Stops, Or Stops
When Driving
Around A Corner
1. Low fuel level. 1. Add fuel.
2. Low oil level. 2. Add oil.
3. Excess oil. 3. Reduce engine oil level.
Unit Starts And
Runs, Then Stops
When The Start
Switch Is
Released
1. Low fluid levels. 1. Check & bring all fluids up to the appropriate levels.
2. Possible overheating. 2. Check for blocked air flow or other possible causes of
overheating.
3. Other functional problem. 3. Contact an Cummins Onan Authorized RV Service & Parts Dealer.
4. No AC output. 4. Contact an Cummins Onan Authorized RV Service & Parts Dealer.
Unit Runs
Then Surges
1. Loose or worn spark plug leads. 1. Check spark plug leads at spark plug & ignition coil.
2. Defective ignition coil, wiring, or control
components.
2. Contact an Cummins Onan Authorized RV Service & Parts Dealer.
3. Faulty spark plug. 3. Remove spark plug & clean or replace.
4. Governor out of adjustment. 4. Contact an Cummins Onan Authorized RV Service & Parts Dealer.
5. Combustion air pre-heat malfunction. 5. Contact an Cummins Onan Authorized RV Service & Parts Dealer.
6. Carburetor icing. 6. Move carburetor pre-heater to the winter position.
7. Carburetor varnishing. 7. Try fuel system cleaner and contact dealer if no change.
Circuit Breaker
Trips
1. Overloaded circuit. 1. Turn-off some of the electrical load, and reset the circuit breaker.
No Electric Output
1. Tripped circuit breaker. 1. Reset the circuit breaker.
2. Other function problem. 2. Contact a Cummins Onan Authorized RV Service & Parts Dealer.
WARNING! Incorrect troubleshooting procedures can result in risks of property damage, or death from
fire, explosion, electrocution, and asphyxiation or being caught or hit by moving parts. DO NOT ATTEMPT
TROUBLESHOOTING unless you are trained and experienced in electrical and mechanical maintenance.
Fault Codes
The genset controller provides extensive diagnostics by causing the status indicator
light on the Control Switch to blink in a coded fashion. Following a fault shutdown,
the indicator light will repeatedly blink 2, 3 or 4 blinks at a time.
• Two blinks indicates a low oil pressure fault.
• Three blinks indicates a service fault. Press Stop once to cause the
two-digit, second-level fault code to blink. (Pressing Stop again will stop the
blinking.)The two-digit code consists of 1, 2, 3, 4 or 5 blinks, a brief pause,
and then 1 to 9 blinks. The rst set of blinks represents the tens digit and the
second set of blinks the units digit of the fault code number. For example,
Fault Code No. 36 appears as:
blink-blink-blink—pause—blink-blink-blink-blink-blink-blink— long pause—
repeat
• Four blinks indicates that cranking exceeded 30 seconds without the
engine starting.
Note: Fault Code Nos. 3 and 4 are rst level faults. Avoid interpreting them as
second-level Fault Code Nos. 33 and 44, which have not been assigned as fault
codes.
Restoring Fault Code Blinking – The fault code stops blinking after ve
minutes (15 minutes, Series HGJAA). Press Stop three times within ve seconds to
restore blinking. Note that the last fault logged will blink, even after the
condition that caused the shutdown has been corrected.
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