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Part number 550-110-260/0200
45
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.
Replace transformer.
Retest.
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.
•
• Using voltmeter, check across top and bottom pins of
120 VAC IN plug.
Does voltmeter indicate 120 VAC?
No Yes
• Reconnect 120 VAC IN plug.
•
Remove 120 VAC transformer PRIMARY plug (
Figure
25, item 2,
page 44) on control module.
• Using voltmeter, check across top and bottom pins of
PRIMARY receptacle.
Does voltmeter indicate 120 VAC?
No Yes
• Reinstall 120 VAC transformer PRIMARY plug.
•
• Using voltmeter, check across pins of receptacle.
Does voltmeter indicate 24 VAC?
No Yes
Chart 2
Chart 6
TSTAT CIRC
light flashing
Chart 3
Chart 4
PRESS SWITCH
light flashing
Chart 5
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 Yes
Is POWER light...
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 —
Remove 120 VAC IN plug (
Figure 25, item 3
, page
44) on control module.
Remove 24 VAC transformer plug (
Figure 25, item 5,
page 44) on control module.