Product Manual

4-6
TABLE 4-1. TROUBLESHOOTING
Some genset service procedures present hazards that can result in severe per-
sonal injury or death. Only trained and experienced service personnel with knowledge of fuels,
electricity, and machinery hazards should perform genset service. See Safety Precautions.
WARNING
MECHANICAL FAULT—CODE NO. 36
(The Controller declared this fault because engine speed fell below 1000 RPM for 0.5 seconds, though
not by Controller action)
Corrective Action:
1. Check fuel level and refill as necessary. (Note: The genset fuel pickup is probably higher than the
vehicle engine fuel pickup.)
2. Prime the engine fuel system for one minute (p. 2-4).
3. Check all fuel fittings for fuel and air leaks and tighten as necessary. Reprime.
4. Check the engine air filter and remove any blockage (p. 3-4).
5. Replace the fuel filter (p. 3-6).
FIELD OVERLOAD—CODE NO. 38
(During normal voltage regulation Field Voltage exceeded 150 VAC for 10 seconds)
Corrective Action:
1. Reduce the number of air conditioners running at the same time, and other appliances that cause
low power factor. (The lower the power factor of a motor or compressor, the more current it draws
per kilowatt. The genset Controller, in turn, must boost field voltage to meet the higher demand for
current imposed by low power factor.)
2. Have the air conditioners and other appliances checked for proper operation. (A locked compressor
rotor can cause a very low power factor.)
GENERATOR ROTOR SHORT—CODE NO. 41
(While field flashing during cranking, the Controller sensed that the rotor circuit was shorted to ground)
Corrective Action: See an authorized Onan dealer.
ROM FAULT—CODE NO. 42
(During startup the genset Controller detected a ROM memory error)
Corrective Action: See an authorized Onan dealer.
RAM FAULT—CODE NO. 43
(During startup the genset Controller detected a RAM memory error)
Corrective Action: See an authorized Onan dealer.
SPEED SENSE LOST—CODE NO. 45
(After start disconnect the Controller lost speed sense [quadrature zero crossings] for 0.25 seconds)
Corrective Action: See an authorized Onan dealer.