Weil-McLain CGA GAS BOILER CGA-5 Series 3 Residential Boilers

User Manual - Page 53

For CGA GAS BOILER CGA-5.

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Part Number 550-142-300/0520
53
CGa Series 3 Gas-Fired Water Boiler — Boiler Manual
11b
Troubleshooting — spark-pilot boilers (continued)
Make sure thermostat is
calling for heat. If lights
still don’t come on, see
Chart 6, page 56.
CHART 3 –– Spark-ignited pilot –– DAMPER light flashing
–– If POWER light is ashing: 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 40 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 5 minutes.
Is Damper light ashing?
No Yes
Remove damper wiring
plug at damper and rmly
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 30, Item 6, page 50)
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 satised.
Does vent damper actuator
indicator show damper is
open ?
No Yes
Replace vent damper
assembly or actuator.
Retest.
Replace control
module.
Retest.
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