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Part Number 550-142-300/0520
51
CGa Series 3 Gas-Fired Water Boiler — Boiler Manual
11b
Troubleshooting — spark-pilot boilers (continued)
Boiler should now
operate normally.
Problem is with incoming
electricity. Have licensed
electrician repair circuit.
Have system checked by a
licensed electrician.
If problem persists, contact
your Weil-McLain Technical
support.
CHART 1 –– Spark-ignited pilot –– Troubleshooting POWER light status
–– Usually indicates reversed 120 VAC polarity if POWER light ashes 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.
TSTAT/CIRC
light ashing
Chart
2
DAMPER
light ashing
Chart
3
FLAME
light ashing
Chart
4
Chart
6
LWCO
light solid
Chart
7
For insufcient heat or no heat problem, go to
Chart 5, page 56, if POWER light is on steady,
with no other light ashing.
Is POWER light off?
No Yes
• 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 Yes
• 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 Yes
• 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 120 VAC ?
No Yes
Replace transformer.
Retest.
Replace control module.
Retest.
Replace control module.
Retest.
Is POWER light . . .
Flashing
alone
Flashing with
another light
On steady
(NOT ashing)
• Usually indicates polarity on incoming 120 VAC power
line is wrong or has insufcient earth ground.
• Check grounds to make sure unit has sufcient grounding.
•
▲ 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 ashing now?
No Yes
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