9-9
TABLE 9-1. TROUBLESHOOTING GENSET FAULTS (CONT.)
Some genset service procedures present hazards that can result in severe personal
injury or death. Only trained and experienced service personnel with knowledge of fuels, electricity,
and machinery hazards should perform genset service. See Safety Precautions.
Accidental or remote starting can cause severe personal injury or death. Before removing a panel or
access door, disconnect the negative (−) cable from the battery to prevent the engine from starting.
WARNING
FAULTY TEMPERATURE SENDER—CODE NO. 24
(Controller sensed open sender)
Corrective Action: Refer to Pages A-1 through A-5, as appropriate.
1. If loose, tighten the ring terminal on sender E2 (Page 5-6). If it is an isolated-ground sender, also
make sure and the flag terminal is connected to terminal 2 on the sender.
2. Disconnect connector P1 (black) from genset controller (Page 5-1) and check continuity between
Pin 9 and ring terminal E2-1. If it is an isolated-ground sender, also check continuity between E2-2
and B− (ground). Repair wiring and connectors as necessary.
3. Test sender E2 and replace as necessary (Page 5-6).
4. Replace the genset controller (p. 5-1).
LOSS OF AC VOLTAGE SENSE—CODE NO. 27
(The genset Controller lost VAC sensing during normal voltage regulation when
the field was functioning normally and frequency was at least 40 Hz)
Corrective Action: Refer to Pages A-1 through A-5, as appropriate.
1. Disconnect connector P3 (green) from the genset controller (Page 5-1) and check continuity be-
tween Pin 11 (S1) and Pin 12 (S2). If open, check for missing, bent or corroded pins and faulty wiring
and repair as necessary.
2. Test and service the generator as necessary (Page 7-2).
3. Replace the genset controller (p. 5-1).
HIGH BATTERY VOLTAGE—CODE NO. 29
(During startup the genset Controller sensed that battery system voltage was greater than
19.2 volts if 12 VDC system or 32.2 volts if 24 volt system)
Corrective Action:
1. Check battery bank connections and reconnect if necessary for 12 volts or 24 volts, depending on
genset model.
2. Select a lower battery booster charge rate (external charging system).
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