Boiler Manual
11d Troubleshooting — control module lights
CHART 1 — Troubleshooting POWER light status
— 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?
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Flashing | Flashing with | On steady | ||
alone | another light | (not flashing) | ||
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| TSTAT CIRC | Chart 2 |
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| light flashing |
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| PRESS SWITCH | Chart 3 | Chart 5 | ||
| light flashing | ||||
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| FLAME | Chart 4 | Chart 6 | ||
| light flashing | ||||
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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
•Restore POWER at service switch or breaker.
Is POWER light flashing now?
No |
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| Have system checked by a | |
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| licensed electrician. | |
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| If problem persists, call your | |
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Boiler should now |
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operate normally. |
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•Make sure service switch or circuit breaker is on or fuses are good.
•Remove 120 VAC IN plug (Figure 25, item 3, page
44)on control module.
•Using voltmeter, check across top and bottom pins of 120 VAC IN plug.
Does voltmeter indicate 120 VAC?
No | Yes | |
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Problem is with incoming electricity. Have licensed electrician repair circuit.
•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 | |
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Replace control module.
Retest.
•Reinstall 120 VAC transformer PRIMARY plug.
•Remove 24 VAC transformer plug (Figure 25, item 5, page 44) on control module.
•Using voltmeter, check across pins of receptacle.
Does voltmeter indicate 24 VAC?
No | Yes | ||
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Replace transformer. |
| Replace control module. |
Retest. |
| Retest. |
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Part number | 45 |
