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Part number 550-110-282/1108
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CGs-4E Gas-Fired Water Boiler — Boiler Manual
Troubleshooting — control module lights (cont.)11d
CHART 5 — PRESS SWITCH light flashing and POWER light on steady
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.
— 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 —
• Boiler should be in
normal operating
sequence.
• Observe operation until
thermostat is satisfied
and inducer has
completed its post-
purge cycle.
• Remove one of the wires connected to the pressure
switch.
• Check continuity across the switch terminals.
Does the ohmmeter indicate the switch is closed?
• 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 11.
• Replace if necessary. Retest.
• Replace inducer
assembly.
• Retest.
No Yes
• Remove INDUCER plug (Figure 25, Item 6, page 46)
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 Yes
Are vent or combustion air passages blocked?
No Yes
• Clear passages and recycle
boiler.
• Recheck boiler operation.
• 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 blower motor operate?
No Yes
No Yes
• Wait 5 minutes.
Is PRESS SWITCH light flashing?