Weil-McLain GOLD CGt Manual page 47

GOLD CGt Gas-Fired Water Boiler — Boiler Manual
11c
Troubleshooting — control module lights
— 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
alone
TSTAT CIRC
light flashing
PRESS SWITCH
light flashing
FLAME
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
Boiler should now
operate normally.
Part Number 550-110-290/0501
CHART 1— Troubleshooting POWER light status
Yes
Flashing with On steady
another light (not flashing)
Chart
2
Chart Chart
3 5
Chart Chart
4 6
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 35, Item 3, page
46) on control module.
• Using voltmeter, check across top and bottom 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 120 VAC IN transformer PRIMARY plug
(Figure 35, Item 2, page 46) on control module.
• Using voltmeter, check across top and bottom pins of
PRIMARY receptacle.
Does voltmeter indicate 120 VAC ?
No
Replace control module.
Retest.
• Reinstall 120 VAC transformer PRIMARY plug.
• Remove 24 VAC transformer plug (Figure 35, Item 5,
page 46) on control module.
• Using voltmeter, check pins of plug.
Does voltmeter indicate 24 VAC ?
No
Replace transformer.
Retest and check for back
feed of voltage from
system wiring.
Yes
Yes
Yes
Replace control module.
Retest.
47