Weil-McLain CGa 3 Series Manual page 54

CGa Series 3 Gas-Fired Water Boiler — Boiler Manual
11b
Troubleshooting — spark-pilot boilers
CHART 4 –– Spark-ignited pilot –– 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 9b) or on boiler label.
Do FLAME and POWER lights still flash ?
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
operating instructions.
• Perform start-up
procedures in boiler
manual to verify proper
operation.
54
–– Usually indicates flame sensed when it shouldn't be there ––
Are manual main shutoff valve and gas valve open ?
No
Yes
• Replace control module.
• Retest.
• Allow boiler to continue cycling.
Are FLAME and POWER lights flashing?
No
• Boiler may now be
operating
normally.
• Perform start-up
procedures in
boiler manual to
verify proper
operation.
• 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 9b) or on boiler label.
• Look through the pilot inspection port to see if the pilot is
burning.
No
Yes
• Replace control
module.
• Retest.
Yes
Is pilot burning?
• Replace gas valve.
• Retest.
Are FLAME and POWER lights flashing?
No
• Replace control
• Boiler should now
module.
operate normally.
• Retest.
• Original flashing
FLAME light
caused by gas
valve not
operating properly.
• See normal
sequence of
operation,
Figure 24,
page 35.
Part Number 550-142-300/0520
(continued)
Yes
Yes