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10002428
Vermont Castings, Majestic Products DVRT36/ 39/ 43
Troubleshooting – Honeywell VS8421
Remove the Window Frame Assembly before service work.
START
CHECK
Gas Supply On
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Pilot Lights With Piezo
Ignitor
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Lockout Has Engaged. Wait 60
Seconds And Try Again.
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For Spark At Electrode While
Depressing Piezo
1/8" Gap To Pilot Hood Needed.
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All Wiring Connections
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Replace Piezo Ignitor
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Supply Line Hooked Up
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Shutoff Valve Open
Pilot Stays Lit
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For Air In The Lines
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Thermopile Needs A Min.
325mv. Adjust Pilot Flame
Height.
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All Wiring Connections
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Replace Thermopile
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Thermocouple Needs A Min. Of
14mv
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Defective Valve. Turn To Pilot,
Meter Should Read Greater
Than 100mv. If Not, Replace.
Pilot Lights Main Burner
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Valve Is Turned On
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Wall Switch Is Not Turned On.
Watch For Grounded Wires!
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Thermopile Needs A Min. 325mv.
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Plugged Burner Orifice
SYSTEM OK
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YES
NO
NO
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NO
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NO
YES
YES
YES
