Product Manual

4-4
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
UNDER VOLTAGE—CODE NO. 13
(After voltage regulation was enabled Output Voltage fell to less than 90% of rated for 5 seconds)
Corrective Action: Turn OFF the line circuit breaker on the operator’s console. If the genset now
runs, run it with fewer connected loads.
OVER FREQUENCY—CODE NO. 14
(After the starter was engaged Frequency jumped to more than 70 Hz for 40 milliseconds, or to more
than 55/66 Hz [50/60 Hz rated] for 6 seconds)
Corrective Action:
1. Check for a tripped genset circuit breaker, reset it if necessary, and run with fewer connected loads.
(A breaker tripping under load can cause genset frequency to overshoot.)
2. Check all fuel fittings for fuel and air leaks and tighten as necessary. Reprime. (Air bubbles can
disrupt frequency.)
UNDER FREQUENCY—CODE NO. 15
(During normal operation Frequency fell to less than 44/54 Hz [50/60 Hz rated] for more than 8 seconds)
Corrective Action:
1. Push the line circuit breaker to OFF and restart the genset. If the genset now runs, run it with fewer
connected loads, especially those with high motor starting loads such as air conditioners.
2. Check all fuel fittings for fuel and air leaks and tighten as necessary. Reprime. (Air bubbles can dis-
rupt frequency.)
3. Replace the engine air filter and clean the spark-arrest muffler (p. 3-4).
4. Replace the fuel filter (p. 3-6).
ACTUATOR SHORTED OR OPEN—CODE NO. 19
(At startup the Controller sensed an open or shorted governor actuator/harness)
Corrective Action: See an authorized Onan dealer.
ACTUATOR OVERLOAD—CODE NO. 22
(Due to connected overload or low engine performance, the Controller maintained the governor actuator
at full-duty cycle—maximum pulse-width-modulated square-wave signal [PWM]—for
60 consecutive seconds)
Corrective Action:
1. Reduce the number of appliances running at the same time, especially those with high motor starting
loads such as air conditioners.
2. Check all fuel fittings for fuel and air leaks and tighten as necessary. Reprime.
3. Replace the engine air filter and clean the spark-arrest muffler (p. 3-4).
4. Replace the fuel filter (p. 3-6).