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5.1
TROUBLESHOOTING GUIDE
PROBLEM
The engine will not crank.
The engine cranks but
will not start.
The engine starts hard
and runs rough.
The Auto/Off/Manual switch
is set to OFF , but the engine
continues to run.
There is no AC output from
the generator.
There is no transfer to
standby after utility
source failure.
Unit consumes large
amounts of oil.
Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators
CAUSE
1. Fuse blown
2. Loose, corroded or defective
battery cables
3. Defective starter contactor (7 kW) 3. *
4. Defective starter motor
5. Dead Battery
1. Out of fuel
2. Defective fuel solenoid (FS)
3. Open #14 wire from
engine control board
4. Defective spark plug(s)
5. Valve lash out of adjustment.
1. Air cleaner
plugged or damaged
2. Defective spark plug(s)
3. Fuel regulator not set.
4. Fuel pressure incorrect.
1. Defective switch
2. Auto/Off/Manual switch
wired incorrectly
3. Defective control board
1. Main line circuit breaker open
2. Generator internal failure
1. Defective transfer switch coil
2. Defective transfer relay
3. Transfer relay circuit open
4. Defective control logic board
1. Break-in procedure
not followed (see Section 3.1)
*Contact your nearest Generac Authorized Dealer for assistance.
Section 5 — Troubleshooting
CORRECTION
1. Replace 15A fuse on generator
control panel.
2. Tighten, clean or replace
as necessary.
4. *
5. Charge or replace battery.
1. Replenish fuel.
2. *
3. *
4. Clean, re-gap or replace plug(s).
5. Reset valve lash.
1. Check, replace air cleaner.
2. Clean, re-gap or replace plug(s).
3. Set fuel regulator.
4. Confirm fuel pressure is at 11"-14"
water column (0.4 psi - 0.5 psi).
1. *
2. *
3. *
1. Reset circuit breaker
to ON (or closed).
2. *
1. *
2. *
3. *
4. *
1. *
23
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