TROUBLE SHOOTING THE GAS CONTROL SYSTEM
HONEYWELL MILLIVOLT VALVE
START
GAS SUPPLY ON
YES
PILOT LIGHTS WITH PIEZO IGNITOR
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| CHECK |
NO |
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| • SUPPLY LINE HOOKED UP | |
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| • SHUTOFF VALVE OPEN |
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| • LOCKOUT HAS ENGAGED. WAIT |
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| 60 SECONDS AND TRY AGAIN. |
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| • PIEZO NOT TIGHT ENOUGH |
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| FOR GOOD GROUND. |
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| • FOR SPARK AT ELECTRODE |
NO |
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| WHILE DEPRESSING PIEZO |
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| (RED BUTTON) — 1/8" GAP TO | |||
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| PILOT HOOD NEEDED. |
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| • ALL WIRING CONNECTIONS |
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| • REPLACE PIEZO IGNITOR |
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| • THERMODISK |
YES
PILOT STAYS LIT
YES
PILOT LIGHTS MAIN
BURNER
YES
NO 
NO 
•FOR AIR IN THE LINES
•THERMOPILE NEEDS A MINIMUM 325mV. ADJUST PILOT FLAME HEIGHT.
•ALL WIRING CONNECTIONS.
•REPLACE THERMOPILE
•THERMOCOUPLE NEEDS A MINIMUM OF 14mV.
•DEFECTIVE VALVE. TURN TO PILOT, METER SHOULD READ GREATER THAN 100 mV. IF NOT, REPLACE.
•THERMODISK
•WALL SWITCH IS NOT
TURNED ON. WATCH FOR GROUNDED WIRES!
•THERMOPILE NEEDS A MINIMUM 325mV.
• PLUGGED BURNER ORIFICE.
SYSTEM OK.
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