Owner`s manual
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Service Diagrams
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 fl uid 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 fl uid 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 fi lter. 1. Replace air fi lter.
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 fl uid levels. 1. Check & bring all fl uids up to the appropriate levels.
2. Possible overheating. 2. Check for blocked air fl ow 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.
WARNING! Incorrect troubleshooting procedures can result in risks of property damage, or death from
fi re, 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.
RV QG 2800 RM
RV QG 2800
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