41
Part Number 550-142-320/0720
GWA
Series 3
Gas-Fired Water Boilers –
Boiler Manual
13 Troubleshooting – spark-ignited pilot boilers
• Make sure thermostat is
calling for heat. If lights
still don’t come on, see
Chart 6, page 44
.
CHART 3 –– Spark-ignited pilot –– DAMPER
light flashing
–– If POWER light is flashing: Usually indicates vent damper failed to prove open within 45 seconds ––
–– If POWER light is steady: Usually indicates vent damper closed during run cycle ––
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.
•
Reset boiler control by turning off power at service switch or turning down thermostat for 2 to 20 seconds.
•
Thermostat should call for heat and appropriate zone valves open. The
TSTAT CIRC
and
LIMIT
lights should come on.
Does vent damper operate
?
No
Yes
•
Wait 45 seconds.
Is
Damper
light flashing?
No
Yes
•
Remove damper wiring
plug at damper and firmly
reconnect.
• Recheck boiler operation.
• If problem persists,
replace vent damper
assembly or actuator.
•
Wait 45 seconds.
Does vent damper operate
?
No
Yes
• Remove
Damper
plug (
Figure
26, Item 6, page 38
)
from plug receptacle of control module.
•
Place voltmeter leads across the top two pins (1 and 4)
of the
Damper
receptacle.
Does voltmeter indicate
24 VAC
?
No
Yes
Are the
TSTAT CIRC
and
LIMIT
lights on steady ?
Yes
No
• Try reseating plug in
module receptacle and
restart.
•
If vent damper still does
not work, replace vent
damper assembly or
actuator.
• Retest.
•
Boiler should be in
normal operating
sequence.
• Observe operation until
thermostat is satisfied.
Does vent damper actuator
indicator show damper is
open ?
No
Yes
•
Replace vent damper
assembly or actuator.
• Retest.
• Replace control
module.
• Retest.
