Weil-McLain CGA Series 2 Manual page 51

CGa Series 2 Gas-Fired Water Boiler — Boiler Manual
11b
Troubleshooting — spark-pilot boilers
CHART 1 –– Spark-ignited pilot –– Troubleshooting POWER light status
–– Usually indicates reversed 120 VAC polarity if POWER light flashes by itself ––
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.
Is POWER light off?
No
Is POWER light . . .
Flashing Flashing with
alone another light
TSTAT/CIRC
light flashing
DAMPER
light flashing
FLAME
light flashing
Sensor Ground
light solid
For insufficient heat or no heat problem, go to
Chart 6, page 56, if POWER light is on steady,
with no other light flashing.
• Usually indicates polarity on incoming 120 VAC power
line is wrong.
• ▲ TURN OFF POWER ▲ at service switch or breaker,
then reverse the HOT and NEUTRAL wires entering
the boiler in the J-box.
• Restore POWER at service switch or breaker.
Is POWER light flashing now?
No
Boiler should now
operate normally.
Part Number 550-142-900/0519
Yes
On steady
(NOT flashing)
Chart
2
Chart
3
Chart Chart
4 6
Chart
7
Yes
Have system checked by a
licensed electrician.
If problem persists, call your
local Weil-McLain sales
representative.
• Make sure service switch or circuit breaker is on or
fuses are good.
• Remove 120 VAC IN plug (Figure 30, Item 3,
page 50) on control module.
• Using voltmeter, check across black and white wire
pins of 120 VAC IN plug.
Does voltmeter indicate 120 VAC?
No
Problem is with incoming
electricity. Have licensed
electrician repair circuit.
• Reconnect 120 VAC IN plug.
• Remove transformer plug (Figure 30, Item 2,
page 50) on control module.
• Using voltmeter, check across left side top and
bottom pins of transformer receptacle.
Does voltmeter indicate 120 VAC?
No
Replace control module.
Retest
• Reinstall transformer plug.
• Remove TSTAT transformer plug (Figure 30, Item 5,
page 50) on control module.
• Using voltmeter, check across left and right pins of
receptacle.
Does voltmeter indicate 24 VAC?
No
Replace transformer.
Retest
(continued)
Yes
Yes
Yes
Replace control module.
Retest.
51