Weil-McLain GOLD CGt Manual page 53

GOLD CGt Gas-Fired Water Boiler — Boiler Manual
11c
Troubleshooting — control module lights
CHART 5 — PRESS SWITCH light flashing and POWER light on steady
— May also be caused by wind gusts in excess of 40 mph for non-direct vent sidewall-vented boilers —
Electrical shock hazard — Wherever you see
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 35, Item 6, page 48)
from plug receptacle of control module.
• Place voltmeter leads across the 120 VAC N and
120 VAC H pins of the INDUCER receptacle (left column
center and right column 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 550-110-290/0107
— Usually indicates pressure switch opened during run cycle —
Does blower motor operate?
No
Yes
• Replace inducer
assembly.
• Retest.
Yes
• Check air pressure switch per manual Section 11b,
page 46.
• Replace if necessary. Retest.
TURN OFF POWER , follow the instructions. Failure to follow
• Wait 5 minutes.
Is PRESS SWITCH light flashing?
No
• Boiler should be in
normal operating
sequence.
• Observe operation until
thermostat is satisfied
and inducer has
completed its post-
purge cycle.
No
Yes
Yes
Is vent blocked?
Yes
• Clear vent and recycle boiler.
• Recheck boiler operation.
(cont.)
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