Generac 04077-1, 04109-1, 04079-1, 00789-1, 00844-1 4.1TROUBLESHOOTING GUIDE, Problem, Cause

Section 4 — Troubleshooting

Guardian Air-cooled Generators

4.1TROUBLESHOOTING GUIDE

PROBLEM	CAUSE		CORRECTION
The engine will not crank.	1.	Fuse blown	1.	Replace fuse.
	2.	Loose, corroded or defective	2.	Tighten, clean or replace
		battery cables		as necessary.
	3.	Defective starter contactor	3.	Replace starter contactor.
	4.	Defective starter motor	4.	Replace starter motor.
	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.	Replace fuel solenoid.
	3.	Open #14 wire from	3.	Check connections and
		engine control board		insulation of #14 wires.
	4.	Defective spark plug(s)	4.	Clean, re-gap or replace plug(s).
The engine starts hard	1.	Air cleaner	1.	Check, clean or replace
and runs rough.		plugged or damaged		air cleaner.
	2.	Defective spark plug(s)	2.	Clean, re-gap or replace plug(s).
The engine starts but shuts	1.	Engine oil level low	1.	Check oil and add oil as needed.
down immediately.	2.	Defective low oil	2.	Replace pressure switch.
		pressure switch
	3.	Defective high temperature	3.	Replace temperature switch.
		switch
	4.	Defective control board	4.	Replace control board.
The Auto/Off/Manual switch	1.	Defective Auto/Off/Manual	1.	Replace switch.
is set to OFF, but the engine	2.	switch	2.	Check wiring and connections.
continues to run.		Auto/Off/Manual switch
		wired incorrectly
	3.	Defective control board	3.	Replace control board.
There is no AC output from	1.	Main line circuit breaker open	1.	Reset circuit breaker
the generator.				to ON (closed) position.
	2.	Generator internal failure	2.	Contact an Authorized
				Dealer.
There is no transfer to	1.	Defective transfer switch coil	1.	Replace transfer switch coil.
standby after utility	2.	Defective transfer relay	2.	Replace transfer relay.
source failure.	3.	Transfer relay circuit open	3.	Close transfer relay circuit.
	4.	Defective control logic board	4.	Replace control logic board.
Unit starts automatically when	1.	Utility not present.	1.	Switch dip switch 2 on control
switched to the AUTO position.				board if utility is not available.
				Check all connections if utility
				should be present.
	2.	Defective Auto/Off/Manual	2.	Replace switch.
		switch
System Set LED is not lit when	1.	Failure present, i.e., low oil	1.	Correct failure.
switched to the AUTO position.	2.	pressure	2.	Switch to the OFF position if
		Dip switch 2 set to the ON
		position		desired.

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