37
Part Number 550-142-785/0812
GWI
Series 2
Gas-Fired Water Boilers –
Boiler Manual
12 Troubleshooting
continued
•
Turn off power to the boiler at service switch or breaker.
•
Wait at least 45 seconds.
•
Turn on power to boiler.
•
Restart boiler, following
Operating instructions
in this
manual (Section 10).
•
Look through the pilot inspection port to see if the pilot is
burning during the prepurge period (first 30 seconds of
operation).
Is pilot burning during prepurge period?
CHART 4
— FLAME & POWER
lights flashing
Electrical shock hazard
— Wherever you see
▲
TURN OFF POWER
▲
, follow the instructions. Failure to follow
instructions could result in severe personal injury, death or substantial property damage.
•
Leave main manual gas valve closed.
•
Turn off power to boiler at service switch or breaker.
•
Wait at least 45 seconds.
•
Turn on power to boiler.
•
Restart boiler, following
Operating instructions
in this
manual (Section 10).
Do FLAME and POWER lights still flash?
•
Boiler should now
operate normally.
•
Original flashing
FLAME light
caused by gas
valve not
operating properly.
•
See normal
sequence of
operation,
Figure 18
,
page 23.
•
Replace gas valve.
•
Retest boiler.
Are FLAME and POWER lights flashing?
No
Yes
No
Yes
Are manual main shutoff valve and gas valve open?
•
Replace control module.
•
Retest.
—
Usually indicates flame sensed when it shouldn't be there
—
Yes
No
• ▲
TURN OFF POWER
▲
to boiler at service switch
or breaker.
•
Open main manual gas
valve.
•
Turn on power to boiler
at service switch or
breaker.
•
Restart boiler per lighting
instructions.
•
Perform start-up
procedures in boiler
manual to verify proper
operation.
•
Allow boiler to continue cycling.
Are FLAME & POWER lights flashing?
No
Yes
No
Yes
•
Replace control
module.
•
Retest.
•
Replace control
module.
•
Retest.
•
Boiler may now be
operating
normally.
•
Perform start-up
procedures in
boiler manual to
verify proper
operation.
