42
Part Number 550-142-320/0720
GWA
Series 3
Gas-Fired Water Boilers –
Boiler Manual
13 Troubleshooting – spark-ignited pilot boilers
CHART 4 –– Spark-ignited pilot –– FLAME & POWER lights flashing
–– Usually indicates flame sensed when it shouldn’t be there ––
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.
Are manual main shutoff valve and gas valve open
?
No
Yes
•
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 11
) or on boiler label.
•
Look through the pilot inspection port to see if the pilot is
burning.
Is pilot burning?
No
Yes
•
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 11
) or on boiler label.
Do
FLAME
and
POWER
lights still flash
?
No
Yes
•
Replace gas valve.
•
Retest.
Are
FLAME
and
POWER
lights flashing?
No
Yes
•
Replace control module.
• Retest.
•
Allow boiler to continue cycling.
Are
FLAME
and
POWER
lights flashing?
No
Yes
• Replace control
module.
• Retest.
• Boiler may now be
operating
normally.
• Perform start-up
procedures in
boiler manual to
verify proper
operation.
• Replace control
module.
• Retest.
•
Boiler should now
operate normally.
•
Original flashing
FLAME
light
caused by gas
valve not
operating properly.
•
See normal
sequence of
operation,
Figure 21, page 27.
•
▲ 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
operating instructions.
• Perform start-up
procedures in boiler
manual to verify proper
operation.
