Weil-McLain CGA Series 2 Manual page 53

CGa Series 2 Gas-Fired Water Boiler — Boiler Manual
11b
Troubleshooting — spark-pilot boilers
–– 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 40 seconds.
• Thermostat should call for heat and appropriate zone valves open. The TSTAT CIRC and LIMIT lights should come on.
• Wait 45 seconds.
Does vent damper operate ?
No
• 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
Are the TSTAT CIRC and LIMIT lights on steady ?
Yes
• Replace control
module.
• Retest.
Part Number 550-142-900/0519
CHART 3 –– Spark-ignited pilot –– DAMPER light flashing
Does vent damper operate ?
No
Yes
Yes
• Try reseating plug in
module receptacle and
restart.
• If vent damper still does
not work, replace vent
damper assembly or
actuator.
• Retest.
No
• Make sure thermostat is
calling for heat. If lights
still don't come on, see
Chart 6, page 56.
Yes
• Wait 5 minutes.
Is Damper light flashing?
No
• Boiler should be in
normal operating
sequence.
• Observe operation until
thermostat is satisfied.
• Replace vent damper
assembly or actuator.
• Retest.
(continued)
Yes
Does vent damper actuator
indicator show damper is
open ?
No Yes
• Remove damper wiring
plug at damper and firmly
reconnect.
• Recheck boiler operation.
• If problem persists,
replace vent damper
assembly or actuator.
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