Specifications

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TABLE 4. TROUBLESHOOTING (CONT.)
Some genset service procedures present hazards that can result in severe per-
sonal injury or death. Only qualified service personnel with knowledge of fuels, electricity, and
machinery hazards should perform genset service. See Safety Precautions.
WARNING
HIGH BATTERY VOLTAGE FAULT—CODE NO. 29
(Voltage across battery system greater than 17.5 volts)
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.
OVERSPEED FAULT—CODE NO. 31
(Engine speed greater than 3600 rpm)
Corrective Action: See an authorized Onan dealer.
LOW CRANKING SPEED FAULT—CODE NO. 32
(Cranking speed less than 180 rpm for more than 2 seconds)
Corrective Action:
1. Replace Fuse F2 (starter solenoid) if blown (Page 7).
2. Clean and tighten the positive (+) and negative (−) battery cable connections at the battery and at
the genset (Page 17).
3. Recharge or replace the battery. Refer to the battery manufacturer’s recommendations.
4. Replace the engine oil with oil of proper viscosity for the ambient temperature (Page 16). (High oil
viscosity can slow cranking speed.)
HIGH ENGINE COOLANT TEMPERATURE FAULT—CODE NO. 33
(Engine coolant temperature exceeded design limit)
Corrective Action:
1. Check the engine coolant level and add coolant and repair leaks as necessary (Page 20).
2. Check for and remove any objects blocking the air inlet or outlet openings in the bottom of the genset.
3. Reduce the number of appliances connected at the same time. (Note that high altitude and high am-
bient temperature decrease engine cooling capacity.)
4. Clean and flush the cooling system to remove coolant passage fouling.
5. If the genset overheats only underway, see the coach manufacture regarding air baffles or other
means to direct cooling air into the genset.