Weil-McLain CGi Series 3 Installation And Maintenance Manual page 54

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Boiler Manual
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Troubleshooting - control module lights
CHART 1 -
Troubleshooting POWER light statu s
- Usually indicates reversed 120 VAC polarity if POWER light flashes by itself -
IAWARNINGI
Electrical shock hazard - Wherever you see
.t.
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?
• Make sure service swttch or circutt breaker is on or
No
Yes
fuses are good.
• Remove 120 VAC IN plug (Figure 38, Item 3, page 53)
on
control module.
• Using voHmeter, check across black and white wire pins
Is
POWER light ...
of 120 VAC IN plug.
Flashing Flashing wtth On steady
Does voltmeter indicate 120 VA C?
alone
another light (not flashing)
1-
No
Yes
TSTAT CIRC
Chart
Problem is with incoming
light flashing
2
electricity. Have licensed
PURGE Chart
Chart
electrician repair circutt.
light flashing
3 5
FLAME
Chart
Chart
• Reconnect 120 VAC IN plug.
light flashing
4 6
• Remove transformer plug (Figure 38, Item 2, page 53)
For insufficient heat or no heat problem, go to
on control module.
Chart 7 if POWER light is on steady, wtth no other
1+-
• Using voHmeter, check across left side top and bottom
light flashing.
pins of transformer receptacle.
Does voltmeter indicate 120 VA C?
No
Yes
~
• Usually indicates polarity on incoming 120 VAC power
Replace control module.
line is wrong.
Retest.
• .t.
TURN OFF POWER
.t.
at service switch or breaker,
then reverse the HOT and NEUTRAL wires entering the
boiler in the J-box.
• Reinstall 120 VAC transformer plug.
• Restore POWER at service swttch or breaker.
• Remove T STAT transformer plug (Figure 38, Item 5,
Is
POWER light flashing now? page 53) on control module.
No
Yes
• Using voHmeter, check pins of plug .
Does voltmeter indicate 24 VAC?
No
Yes
Have system checked by a
+
licensed electrician. If
Replace transformer.
problem persists, call your
Retest and check for back
Boiler should now
I
local Weii-Mclain sales
feed of voltage from
Replace control module.
operate normally.
representative.
system wiring.
Retest.
54
Part Number 550-142-780/0712