CGi Manual

Part Number 550-142-302/0520
CGi
SERIES 4 — GAS-FIRED WATER BOILER — Boiler Manual
56
Troubleshooting — control module lights (cont.)
11c
CHART 4 –– FLAME & POWER light flashing
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Electrical shock hazardTURN OFF POWER

•  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.
• Boiler may now be
operating
normally.
• Perform start-up
procedures in
boiler manual to
verify proper
operation.
• Replace control module.
• Retest.
Are manual main shutoff valve and gas valve open?
No Yes
• Replace gas valve.
• Retest boiler.
Are FLAME & POWER
No Yes
• Replace control
module.
• Retest.
• Boiler should now
operate normally.
• Original flashing
FLAME light
caused by gas
valve not
operating properly.
• See normal
sequence of
operation,
Figure 30,
page 38.
• 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 Yes
• Replace control
module.
• Retest.
• 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
No Yes
• Allow boiler to continue cycling.
Are FLAME & POWER
No Yes