CGi Manual

Part Number 550-142-302/0520
CGi
SERIES 4 — GAS-FIRED WATER BOILER — Boiler Manual
57
Troubleshooting — control module lights (cont.)
11c
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TURN OFF POWER

• 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.
Does inducer motor operate?
No Yes
• 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.
• Check air pressure switch per manual Section 11b.
• Replace if necessary. Retest.
• Clear vent and recycle boiler.
• Recheck boiler operation.
• Replace inducer
assembly.
• Retest.
• Boiler should be in
normal operating
sequence.
• Observe operation until
thermostat is satisfied
and inducer has
completed its post-
purge cycle.
• 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 Yes
• Remove one of the wires connected to the pressure
switch.
• Check continuity across the switch terminals.

No Yes
• Wait 5 minutes.
Is PURGE
No Yes
Is vent blocked?
No Yes