Weil-McLain CGi 4 Series Manual page 56

CGi
SERIES 4 — GAS-FIRED WATER BOILER —
11c
Troubleshooting — control module lights
–– 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.
• 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 9c).
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.
56
CHART 4 –– FLAME & POWER light flashing
Are manual main shutoff valve and gas valve open?
No
Yes
• Replace control module.
• Retest.
• Allow boiler to continue cycling.
Are FLAME & POWER lights flashing?
No
• Boiler may now be • Replace control
operating
normally.
• Retest.
• Perform start-up
procedures in
boiler manual to
verify proper
operation.
Boiler Manual
• 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 9c).
• 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?
No
• Replace gas valve.
• Retest boiler.
Yes
• Boiler should now
operate normally.
module.
• Original flashing
FLAME light
caused by gas
valve not
operating properly.
• See normal
sequence of
operation,
Figure 30,
page 38.
120
Yes
Yes
Are FLAME & POWER lights flashing?
No
• Replace control
module.
• Retest.
Part Number 550-142-302/0124
(cont.)
Yes