Weil-McLain CGi 4 Series Manual page 57

CGi
SERIES 4 — GAS-FIRED WATER BOILER —
11c
Troubleshooting — control module lights
–– May also be caused by wind gusts in excess of 31 mph for non-direct vent sidewall-vented boilers ––
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• 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.
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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 550-142-302/0520
CHART 5 –– PURGE light flashing and POWER light on steady
–– Usually indicates pressure switch opened during run cycle ––
Does inducer motor operate?
No
Yes
• Replace inducer
assembly.
• Retest.
Yes
• Check air pressure switch per manual Section 11b.
• Replace if necessary. Retest.
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TURN OFF POWER
• Wait 5 minutes.
Is PURGE NKIJV CUJKPI!
No
• Boiler should be in
normal operating
sequence.
• Observe operation until
thermostat is satisfied
and inducer has
completed its post-
purge cycle.
Is vent blocked?
No
(cont.)
Yes
Yes
Yes
• Clear vent and recycle boiler.
• Recheck boiler operation.
57