GOLD CGs 
11d Troubleshooting — control module lights (cont.)
CHART 7 — Insufficient heat or no heat to system (POWER light on steady)
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.
• Has it been at least 5 minutes since setting thermostat to call for heat? If not, wait 5 minutes. Is system heating?
• Is thermostat set to call for heat? Remove thermostat wires at boiler and check continuity across the two wires. If circuit isn't closed, check external thermostat (zone valve, relay, etc.) wiring. Correct problems and retry.
• Reconnect external thermostat wiring at boiler.
Is thermostat circuit closed (continuity across wires)?
No |
| Yes |
Is boiler System circulator operating?
No | Yes |
•Remove CIRCULATOR harness plug from CIRCULATOR plug receptacle (Figure 25, Item 7, page 46). Check with voltmeter across pins of control module receptacle.
Does voltmeter show 120 VAC across pins?
No | Yes |
Are all red lights off?
No | Yes | |
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Wait 30 seconds. Are all red lights off?
No | Yes | |
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Replace control module. Retest.
•Boiler is in standby.
•Set thermostat to call for heat and recheck
operation.
•Verify Sequence of operation, Figure 18, page 31.
• | Replace control |
| • | Repair/replace |
| module. |
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| circulator. Retest. |
• | Retest. |
| • | Repair/replace |
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| wiring. Retest. |
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• Wait 5 minutes.
| Is FLAME light on? | ||||
Yes |
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•If you have sufficient heat — boiler should be in normal operating sequence. (See normal sequence of operation, Figure 18, page 31.)
•If you have less than sufficient heat —
| Is LIMIT light on? |
No | Yes |
Is vent or combustion air piping free of blockage?
No |
| Yes | ||
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• Correct conditions and |
| Contact your | ||
recheck operation. |
| sales representative. | ||
•See Figure 18, page 31 for normal sequence of operation.
•Wait for boiler water to cool to temperature 20 to 30 °F
lower than temperature set on limit switch.
•Check limit switch contacts with continuity checker.
Are limit switch contacts
closed?
| No |
| Yes | ||
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•Replace control module.
•Retest.
Check rollout switch continuity — is switch closed?
No |
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Are limit switch contacts closed?
| No |
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| • Boiler water temperature exceeded | |||
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| setting on limit switch with thermostat | |||
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• | Replace |
| calling for heat. Boiler is OK. (See normal | ||||
| sequence of operation, Figure 18, p. 31.) | ||||||
| limit switch. |
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| • Also check setting on limit switch (should | |||||
• | Retest. |
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| be above 140°F.). | ||||||
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• Replace rollout switch.
If rollout thermal fuse element has opened, determine cause and correct condition. Failure to do so will cause severe personal injury, death or substantial property damage.
•Check any other limit controls wired into the limit circuit. If all are OK, then replace control module.
•Retest.
Part number | 53 |
