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CGi
SERIES 4 — GAS-FIRED WATER BOILER —
11c
Troubleshooting — control module lights
CHART 5 –– PURGE light flashing and POWER light on steady
–– Usually indicates pressure switch opened during run cycle ––
–– May also be caused by wind gusts in excess of 31 mph for non-direct vent sidewall-vented boilers ––
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.
• Reset boiler control by turning off power at service switch or turning down thermostat for at least 45 seconds.
• Thermostat should call for heat and appropriate zone valves open.
• Remove INDUCER plug (Figure 38, Item 6, page 52)
from plug receptacle of control module.
• Place voltmeter leads across the 120VAC N and
120VAC H pins of the INDUCER receptacle (middle and
bottom pins).
Does the voltmeter indicate 120 VAC?
No
• Remove one of the wires connected to the pressure
switch.
• Check continuity across the switch terminals.
Does the ohmmeter indicate the switch is closed?
No
• Inspect and check wire
harness from control
module to pressure switch.
• Reseat connector in control
module receptacle.
• If harness is intact and
properly seated, but
problem persists, replace
control module.
• Retest.
Part Number 550-142-302/0124
Does inducer motor operate?
No
Yes
• Replace inducer
assembly.
• Retest.
Yes
• Check air pressure switch per manual Section 11b.
• Replace if necessary. Retest.
Boiler Manual
• Wait 5 minutes.
No
• Boiler should be in
normal operating
sequence.
• Observe operation until
thermostat is satisfied
and inducer has
completed its post-
purge cycle.
No
Yes
Is PURGE light flashing?
Yes
Is vent blocked?
Yes
• Clear vent and recycle boiler.
• Recheck boiler operation.
(cont.)
57
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