Condition
Possible cause
Action
Fan motor starts.
Lockout during pre-purge.
Jammed or damaged servomotor.
Servomotors do not reach desired
position.
Check and adjust or change.
Burner control stays waiting for
start release.
Start-up release loop is open.
Find out cause, repair.
Low gas pressure.
Find cause and repair.
Faulty differential air pressure
switch.
Change.
Motor failure
Condition
Possible cause
Action
Fan or oil pump motor does not
start. Lockout occurs.
Break in main circuit.
Find out cause of the break.
Break in control circuit.
Find out cause of the break, see
circuit diagram. Check burner
control operation. Replace faulty
burner control.
Motor overload/thermal relay
released.
Check setting, reset.
Faulty motor contactor.
Change.
Faulty motor.
Change.
Fault in variable speed drive or
soft starter (if equipped).
Check error and reset.
Lack of fan air pressure
Condition
Possible cause
Action
Fan motor starts, but during pre-
purge period lockout occurs.
Faulty differential air pressure
switch setting.
Check setting, adjust if necessary.
Dirty or damaged differential air
pressure switch impulse tubes.
Clean or replace.
Faulty differential air pressure
switch.
Change.
Fan suction blocked.
Clean.
Incorrect motor rotation direction. Reconnect motor.
Leakage test failure
Condition
Possible cause
Action
Leakage test failure
Gas block failure
See section
Gas valve proving
.
Gas inlet pressure to burner too
low
Find out cause and repair.
Faulty pressure switch
Change.
Faulty gas valve
Change.
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M4219 2305EN
Summary of Contents for GP-600 M
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