NVC Series
Troubleshooting
Honeywell Electronic Ignition
START
| Turn gas supply off | NO | ||
| Turn ON/OFF Switch |
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| to call for heat. |
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| Power to module |
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| (24V nominal) |
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| YES |
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| NO |
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| Spark across | |||
| Ignitor Sensor gap |
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| YES |
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Turn gas on | NO |
Pilot burner lights? |
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YES
Spark stops when pilot | NO |
is lit?
YES
CHECK : 
Line Voltage (120VAC)
Low Voltage Transformer (19.5 minimum VAC)
ON/OFF Switch
Wiring connections 
Thermodisk
Unplug Ignition Lead | NO |
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and check spark |
| Replace Module | |
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at module |
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(24VAC nominal) |
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Spark OK?
YES
Check ignition cable, ground wiring, Ceramic Insulator and gap. Correct as necessary 
Check boot of ignition cable for signs of melting or buckling. Take protective actions to shield cable and boot from excessive temperatures.
Check that all manual gas valves are open, supply tubing and pressures are good, and pilot burner orifice is not blocked.
Check electrical connections between module and pilot operator on gas control. 
Check for 24VAC across
NOTE: If S8600B goes into lockout, reset system.
Check continuity of ignition cable and ground wire.
Clean flame rod.
Check electrical connections beween flame rod and module.
Check for cracked ceramic flame rod insulator.
Check that pilot flame covers flame rod and is steady blue.
Adjust pilot flame.
If problem persists, replace module.
Main Burner lights?
YES
System runs until
ON/OFF switch is in
"OFF" position
YES 
Troubleshooting
Ends
NO
NO
Check for 24VAC across 
Check electrical connections between module and gas control. If okay, replace gas control or gas control operator.
NOTE: If S8600B goes into lockout, reset system.
Check for continuity of igniton cable and ground wire. NOTE: If ground is poor or erratic, shutdowns may occur occasionally even though operation is normal
at time of checkout.
Check that the pilot flame covers flame rod and is steady and blue. 
If checks are okay, replace module.
FP649
20000194 | 15 |
