Generac Power Systems 04389-3, 04456-3, 04390-3 Troubleshooting Guide, Problem, Cause, Correction

Section 5 — Troubleshooting

Air-cooled 7 kW, 12 kW and 15 kW Generators

5.1TROUBLESHOOTING GUIDE

Problem	Cause	Correction
The engine will not crank.	1. Fuse blown.	1. Replace 15A fuse in generator
		control panel.

2.Loose, corroded or defective battery cables.

2.Tighten, clean or replace as necessary.

	3.	Defective starter contactor. (7 kW) 3.		*
	4.	Defective starter motor.	4.	*
	5.	Dead Battery.	5.	Charge or replace battery.
The engine cranks but	1.	Out of fuel.	1.	Replenish fuel.
will not start.	2.	Defective fuel solenoid (FS).	2.	*
	3.	Open #14 wire from	3.	*
		engine control board.

4.Defective spark plug(s).

5.Valve lash out of adjustment.

4.Clean, re-gap or replace plug(s).

5.Reset valve lash.

The engine starts hard	1.	Air cleaner plugged	1.	Check, replace air cleaner.
and runs rough.		or damaged.
	2.	Defective spark plug(s).	2.	Clean, re-gap or replace plug(s).
	3.	Fuel Regulator not set.	3.	Set Fuel Regulator.
	4.	Fuel Pressure incorrect.	4.	Confirm fuel pressure to regulator
				is 10-12” water column (0.36-0.43
				psi) for LP, and 5-7” water colum
				(0.18-0.25 psi) for natural gas.
The Auto/Off/Manual switch	1.	Defective switch.	1.	*
is set to OFF, but the engine	2.	Auto/Off/Manual switch	2.	*
continues to run.		wired incorrectly.
	3.	Defective control board.	3.	*
There is no AC output from	1.	Main line circuit breaker open.	1.	Reset circuit breaker
the generator.				to ON (or closed).
	2.	Generator internal failure.	2.	*
There is no transfer to	1.	Defective transfer switch coil.	1.	*
standby after utility	2.	Defective transfer relay.	2.	*
source failure.	3.	Transfer relay circuit open.	3.	*
	4.	Defective control logic board.	4.	*
Unit consumes large	1.	Break-in procedure	1.	*
amounts of oil.		not followed (see Section 3.1).

*Contact the nearest Authorized Dealer for assistance.

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