GOLD CGa Gas-Fired Water Boiler
54 Part Number 550-110-593/1099
Troubleshooting — spark-ignited pilot boilers11c
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.
Problem is with incoming
electricity. Have licensed
electrician repair circuit.
Replace control module.
Retest.
Boiler should now
operate normally.
Have system checked by a
licensed electricain.
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
53) on control module.
• Using voltmeter, check across top and bottom pins
of 120 VAC IN plug.
Does voltmeter indicate 120 VAC?
No Yes
No Yes
No Yes
Chart
3
Chart
6
TSTAT CIRC
light flashing
Chart
4
Chart
5
DAMPER
light flashing
For insufficient heat or no heat problem, go to
Chart 7 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 Yes
Flashing
alone
Flashing with
another light
On steady
(not flashing)
No Yes

Is POWER light off?

— Usually indicates reversed 120 VAC polarity if POWER light flashes by itself —
Chart 2 — Spark-ignited pilot —Troubleshooting POWER light status

Is POWER light...

FLAME
light flashing • Reconnect120 VAC IN plug.
• Remove 120 VAC transformer PRIMARY plug
(Figure 30,Item 2, page 53) on control module.
• Using voltmeter, check across top and bottom pins
of PRIMARY receptacle.
Does voltmeter indicate 120 VAC?
• Reinstall120 VAC transformer PRIMARY plug.
• Remove 24 VAC transformer plug (Figure 30,Item 5,
page 53) on control module.
• Using voltmeter, check across pins of receptacle.
Does voltmeter indicate 120 VAC?
Replace control module.
Retest.
Replace transformer.
Retest.