Weil-McLain CGA GAS BOILER CGA-5 Series 3 Residential Boilers

User Manual - Page 51

For CGA GAS BOILER CGA-5.

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Part Number 550-142-300/0520
51
CGa Series 3 Gas-Fired Water Boiler — Boiler Manual
11b
Troubleshooting — spark-pilot boilers (continued)
Boiler should now
operate normally.
Problem is with incoming
electricity. Have licensed
electrician repair circuit.
Have system checked by a
licensed electrician.
If problem persists, contact
your Weil-McLain Technical
support.
CHART 1 –– Spark-ignited pilot –– Troubleshooting POWER light status
–– Usually indicates reversed 120 VAC polarity if POWER light ashes 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.
TSTAT/CIRC
light ashing
Chart
2
DAMPER
light ashing
Chart
3
FLAME
light ashing
Chart
4
Chart
6
LWCO
light solid
Chart
7
For insufcient heat or no heat problem, go to
Chart 5, page 56, if POWER light is on steady,
with no other light ashing.
Is POWER light off?
No Yes
Make sure service switch or circuit breaker is on or
fuses are good.
Remove 120 VAC IN plug (Figure 30, Item 3,
page 50) on
control module
.
Using voltmeter, check across black and white wire
pins of 120 VAC IN plug.
Does voltmeter indicate 120 VAC ?
No Yes
Reconnect 120 VAC IN plug.
Remove transformer plug (Figure 30, Item 2,
page 50) on
control module
.
Using voltmeter, check across left side top and
bottom pins of transformer receptacle.
Does voltmeter indicate 120 VAC ?
No Yes
Reinstall transformer plug.
Remove TSTAT transformer plug (Figure 30, Item 5,
page 50) on
control module
.
Using voltmeter, check across left and right pins of
receptacle.
Does voltmeter indicate 120 VAC ?
No Yes
Replace transformer.
Retest.
Replace control module.
Retest.
Replace control module.
Retest.
Is POWER light . . .
Flashing
alone
Flashing with
another light
On steady
(NOT ashing)
Usually indicates polarity on incoming 120 VAC power
line is wrong or has insufcient earth ground.
Check grounds to make sure unit has sufcient 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 ashing now?
No Yes
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