Weil-McLain CGi 4 Series Manual page 53

CGi
SERIES 4 — GAS-FIRED WATER BOILER —
11c
Troubleshooting — control module lights
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Is POWER light off?
No
Is POWER light . . .
Flashing Flashing with
alone? another light?
TSTAT/CIRC
light flashing
PURGE
light flashing
FLAME
light flashing
LWCO
light solid
For insufficient heat or no heat problem, go to
CHART 8 if POWER light is on steady, with no other
light is flashing.
• Usually indicates polarity on incoming 120 VAC power
line is wrong or has insufficient earth ground.
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•
TURN OFF POWER
then reverse the HOT and NEUTRAL wires entering the
boiler in the J-box.
• Restore POWER at service switch or breaker.
Is POWER NKIJV CUJKPI PQY!
No
Boiler should now
operate normally.
Part Number 550-142-302/0520
CHART 1 –– Troubleshooting POWER light status
Yes
On steady
(NOT flashing)?
CHART
2
CHART CHART
3 5
CHART CHART
4 6
CHART
7
at service switch or breaker,
Yes
Have system checked by a
licensed electrician.
If problem persists, contact
your Weil-McLain Technical
support.
Boiler Manual
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TURN OFF POWER
• Make sure service switch or circuit breaker is on or
fuses are good.
• Remove 120 VAC IN plug (Figure 38, Item 3, page 52)
on control module.
• Using voltmeter, check across black and white wire 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 transformer plug (Figure 38, Item 2, page 52)
on control module.
• Using voltmeter, check across left side top and bottom
pins of transformer receptacle.
Does voltmeter indicate 120 VAC?
No
Replace control module.
Retest.
• Reinstall 120 VAC transformer plug.
• Remove TSTAT transformer plug (Figure 38, Item 5,
page 52) 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.
120
Yes
Yes
Yes
Replace control module.
Retest.
53