Weil-McLain GOLD CGt Manual page 52

GOLD CGt Gas-Fired Water Boiler — Boiler Manual
11c
Troubleshooting — control module lights
Electrical shock hazard — Wherever you see
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 lighting
instructions.
• Perform start-up
procedures in boiler
manual to verify proper
operation.
5
CHART 4 — FLAME & POWER lights flashing
— 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 & POWER lights flashing?
No
• Boiler may now be
operating
normally.
• Perform start-up
procedures in
boiler manual to
verify proper
operation.
TURN OFF POWER , follow the instructions. Failure to follow
• 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 10 seconds of
operation).
Is pilot burning during prepurge period?
No
• Replace gas valve.
• Retest boiler.
Yes
• Replace control • Boiler should now
module.
• Retest. • Original flashing
• See normal
Yes
Yes
Are FLAME and POWER lights flashing?
No
• Replace control
operate normally. module.
• Retest.
FLAME light
caused by gas
valve not
operating properly.
sequence of
operation,
Figure 28,
page 34.
Part Number 550-110-290/0107
(cont.)
Yes