Generac Power Systems 04758-2, 04759-2, 04760-2 Troubleshooting Guide, Problem, Cause, Correction

Section 5 — Troubleshooting

Guardian 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 on generator
				control panel.
	2.	Loose, corroded or defective	2.	Tighten, clean or replace
		battery cables		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)	4.	Clean, re-gap or replace plug(s).
	5.	Valve lash out of adjustment.	5.	Reset valve lash.
The engine starts hard	1.	Air cleaner	1.	Check, replace air cleaner.
and runs rough.		plugged 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 is at (0.4-
				0.5 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 Generac Authorized Dealer for assistance.

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