Weil-McLain CP7531680 Manual page 53

CGi
GAS-FIRED WATER BOILER — SERIES 3 —
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 Flashing with
alone? another light?
TSTAT/CIRC
light flashing
PURGE
light flashing
FLAME
light flashing
SENSOR GROUND
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.
• Check grounds to make sure unit has sufficient grounding.
• ▲ 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 550-142-902/1016
CHART 1 –– Troubleshooting POWER light status
Yes
On steady
(NOT flashing)?
CHART
2
CHART CHART
3 5
CHART CHART
4 6
CHART
7
Yes
Have system checked by a
licensed electrician.
If problem persists, call your
local Weil-McLain sales
representative.
Boiler Manual
• 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