Product Manual

4-5
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
FAULTY ENGINE TEMPERATURE SENDER—CODE NO. 24
(After 10 minutes of normal operation the Controller checked for and sensed
an open temperature sender/harness)
Corrective Action: See an authorized Onan dealer.
VAC SENSE LOST—CODE NO. 27
(The Controller lost VAC sensing during normal voltage regulation when the field was functioning nor-
mally and frequency was at least 40 Hz)
Corrective Action: See an authorized Onan dealer.
HIGH BATTERY VOLTAGE—CODE NO. 29
(During startup the Controller sensed that battery system voltage was greater than 19.2 volts for 5 milli-
seconds or greater than 19.2 volts for 1 second will running)
Corrective Action:
1. Check battery bank connections and reconnect if necessary so that the 12 volt batteries serving the
genset are connected in parallel (12 volt) rather than in series (24 volt).
2. Select a lower battery booster charge rate.
STARTING FAULT—CODE NO. 32
(The Controller could not detect cranking speed [quadrature zero crossings] for 12 seconds)
Corrective Action:
1. Have the vehicle propulsion engine running while trying to start the genset. Its charging alternator
may be able to maintain a high enough battery terminal voltage to start the genset.
2. Service the battery as necessary by cleaning and tightening connections, recharging or replacing
the battery or replacing damaged battery cables.
3. Change the engine oil to oil of the proper viscosity for the ambient temperature. High oil viscosity
can slow down cranking speed.
EE CHECKSUM FAULT—CODE NO. 35
(During startup the genset Controller detected an EE memory error)
Corrective Action: See an authorized Onan dealer.