Weil-McLain GOLD CGS 550-110-260/02002 - Manual (Page 48)

Part number 550-110-260/0200
48
GOLD CGs Gas-Fired Water Boiler
Troubleshooting — control module lights
11d
• Turn off power to the boiler at service switch or breaker.
• Wait at least 45 seconds.
• Turn on power to boiler.
• Restart boiler, following Lighting instructions in this
manual (Figure 21, page 34).
• 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?
CHART 4 — 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 Lighting instructions in this
manual (Figure 21, page 34).
Do FLAME and POWER lights still flash?
• Boiler should now
operate normally.
• Original flashing
FLAME light
caused by gas
valve not
operating
properly.
• See normal
sequence of
operation,
Figure 18,
page 31.
• Replace gas valve.
• Retest boiler.
Are FLAME and POWER lights flashing?
No Yes
No Yes
Are manual main shutoff valve and gas valve open?
• Replace control module.
• Retest.
— Usually indicates flame sensed when it shouldn't be there —
Yes 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.
• Allow boiler to continue cycling.
Are FLAME & POWER lights flashing?
No Yes No Yes
• Replace control
module.
• Retest.
• Replace control
module.
• Retest.
• Boiler may now be
operating
normally.
• Perform start-up
procedures in
boiler manual to
verify proper
operation.