Weil-McLain GOLD CGS 550-110-260/0107 Manual page 50

GOLD CGs Gas-Fired Water Boiler — Boiler Manual
11d
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.
50
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 • Replace control
operating
normally.
• Retest.
• 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 (in front of air inlet
box) 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.
Are FLAME and POWER lights flashing?
Yes
• Boiler should now
module. operate normally.
• Original flashing
FLAME light
caused by gas
valve not
operating properly.
• See normal
sequence of
operation,
Figure 18,
page 31.
Yes
Yes
No
Yes
• Replace control
module.
• Retest.
Part number 550-110-260/0107
(cont.)