VIII Check-out procedure — troubleshooting
Correct by making connections.
Check for open thermostat, circulator relay, operating control, limit control or LWCO. Check the
If limit controls or water level controls lockout on manual reset, determine cause and correct condition. Failure to do so could result in severe personal injury, death or substantial property damage.
Replace ignition control. Retest.
Securely connect spark wire. Then turn ON supply voltage. Retest.
Replace pilot assembly. Retest.
Is spark gap 0.125" and isolated in pilot gas stream?
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| Replace pilot assembly, |
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| turn ON supply voltage. |
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| Operate system several |
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| Replace ignition | ||
| complete heat cycles. |
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VISUALLY CHECK — Is ground wire connected from GND (Burner) to ignition control mounting screw, and ground wire connected from transformer terminal C to case ground?
No | Yes | |
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Is 24VAC present across terminals 24V and 24V(GND)?
| No | Yes | ||
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Open thermostat (or operating control) contacts for 15 seconds. Close thermostat contacts. Is 24VAC across terminals PV & MV/PV?
No | Yes | |
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Turn OFF supply voltage.
Electrical shock hazard. Failure to turn off power before proceeding could cause severe personal injury or death.
Check spark wire. Is it securely connected to spark transformer?
No | Yes | |
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Is condition of spark wire good (not cut, brittle, burned or cracked)?
No | Yes | |
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Is spark electrode ceramic cracked?
No | Yes | |
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Replace pilot assembly, turn ON supply voltage, operate system several complete heat cycles.
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