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Part number 550-110-282/1108
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CGs-4E Gas-Fired Water Boiler — Boiler Manual
Troubleshooting — control module lights11d
CHART 1 — Troubleshooting POWER light status
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 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 25, 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
Yes
No
Yes
No
Yes
Chart
2
Chart
6
TSTAT CIRC
light flashing
Chart
3
Chart
4
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.
No
Yes
On steady
(not flashing)
No
Yes
— Usually indicates reversed 120 VAC polarity if POWER light flashes by itself —
Is POWER light off?
Is POWER light ...
Flashing
alone
Flashing with
another light
• Reconnect 120 VAC IN plug.
• Remove 120 VAC IN transformer PRIMARY plug
(Figure 25, Item 3, page 46) on control module.
• Using voltmeter, check across top and bottom pins of
PRIMARY receptacle.
Does voltmeter indicate 120 VAC?
• Reinstall 120 VAC transformer PRIMARY plug.
• Remove 24 VAC transformer plug (Figure 25, Item 3,
page 46) on control module.
• Using voltmeter, check pins of plug.
Does voltmeter indicate 24 VAC?
Replace control module.
Retest.
Replace transformer.
Retest and check for back
feed of voltage from
system wiring.
• 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?
Chart
5