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DV360/580 Series Direct Vent Gas Fireplace
20010667
Troubleshooting - Honeywell VS8421
Remove Window Frame Assembly Before Service Work
START CHECK
Gas Supply On
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Pilot Lights With Piezo
Ignitor
• Lockout Has Engaged. Wait 60
Seconds And Try Again.
• For Spark At Electrode While
Depressing Piezo
1/8" Gap To Pilot Hood Needed.
• All Wiring Connections
• Replace Piezo Ignitor
• Supply Line Hooked Up
• Shutoff Valve Open
Pilot Stays Lit
• For Air In The Lines
• Thermopile Needs A Min.
325mv. Adjust Pilot Flame
Height.
• All Wiring Connections
• Replace Thermopile
• Thermocouple Needs A Min. Of
14mv
Pilot Lights Main Burner
• Valve Is Turned On
• Wall Switch Is Not Turned On.
Watch For Grounded Wires!
• Thermopile Needs A Min. 325mv.
• Plugged Burner Orifice
• Defective Valve. Turn To Pilot,
Meter Should Read Greater Than
100mv. If Not, Replace.
SYSTEM OK
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YES
NO
NO
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NO
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NO
YES
YES
YES