38
Part Number 550-142-785/0812
GWI
Series 2
Gas-Fired Water Boilers –
Boiler Manual
12 Troubleshooting
continued
CHART 5
—
PURGE
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 12.
•
Replace if necessary. Retest.
•
Replace inducer
assembly.
•
Retest.
No
Yes
•
Remove
INDUCER
plug (
Figure 23, Item 6, page 33
)
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
Is vent blocked?
No
Yes
•
Clear vent 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 PURGE
light flashing?
