9-5
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
WARNING—SHUTDOWN DUE TO VESSEL CO—CODE NO. 5
(Dangerous levels of Carbon Monoxide in Vessel)
Corrective Action: Get everyone out into fresh air immediately and seek medical attention.
LOSS OF RAW WATER FLOW—CODE NO. 7
(Low raw water pressure in heat exchanger)
Corrective Action:
1. Open the sea cock.
2. Check for a blocked sea water strainer and clean it out. If above the water line, fill the strainer with
water to assist priming.
3. Check for kinked or leaking hoses and reconnect, reroute or replace.
4. If loose, reconnect terminals S6+ and S6− to raw water flow switch S6 (p. 5-7).
5. Check for a worn raw water impeller and replace as necessary (p. 4-12).
6. Check the bottom of the hull for any blockage at the through-hull fitting.
7. Disconnect connector P1 (black) from genset controller (Page 5-1) and check continuity between
Pin 8 and terminal S6+ and between terminal S6− and B− (ground). Repair wiring and connectors
as necessary.
8. Test raw water flow switch S6 and replace as necessary (Page 5-7).
9. Replace the genset controller (p. 5-1).
HIGH AC VOLTAGE—CODE NO. 12
(After voltage regulation was enabled Output Voltage jumped to more than 125% of rated for 75 millisec-
onds or to more than 115% of rated for 3 seconds)
Corrective Action:
1. Check for a tripped genset circuit breaker, reset if necessary, and run with fewer loads. (A breaker
tripping under load can cause genset voltage to overshoot.)
2. Check all fuel fittings and filters for fuel and air leaks and tighten as necessary. (Air bubbles can
disrupt genset frequency/voltage.)
3. Prime the engine fuel system for at least 30 seconds (p. 3-3).
4. Push the genset line circuit breaker OFF, start the genset and measure output voltage. If output
voltage is normal, the problem is in the circuits external to the genset. If there is no voltage, test for
grounded or shorted main, field or quadrature windings and service as necessary (p.7-2).
5. Replace the genset controller (p. 5-1).
Redistribution or publication of this document,
by any means, is strictly prohibited.
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