36
Part Number 550-142-785/0812
GWI
Series 2
Gas-Fired Water Boilers –
Boiler Manual
12 Troubleshooting
continued
CHART 3
—
PURGE & POWER
lights flashing
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.
•
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?
•
Replace control
module.
•
Retest.
•
Check air pressure switch
per manual Section 12.
•
Replace if necessary.
•
Retest.
•
Try reseating plug in
module receptacle and
restart.
•
If inducer still does not
work, replace inducer
assembly.
•
Retest.
No
Yes
•
Wait 45 seconds.
Does inducer motor operate?
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
Are vent or combustion air
passages blocked?
No
Yes
•
Clear passages and
recycle boiler.
•
Recheck boiler operation.
No
Yes
•
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
—
Usually indicates pressure switch stuck closed or failed to make within 5 minutes
—
•
Wait 5 minutes.
Is PURGE light flashing?
