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• GAS SUPPLY ON
• SUPPLY LINE HOOKED UP
• SHUTOFF VALVE OPEN
NO
NO
NO
NO
• 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
• 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.
PILOT LIGHTS WITH
PIEZO IGNITOR
YES
YES
YES
YES
PILOT STAYS LIT
PILOT LIGHTS MAIN
BURNER
SYSTEM OK.
START
CHECK
• VALVE IS TURNED ON
• ON/OFF SWITCH IS NOT
TURNED ON. WATCH
FOR GROUNDED WIRES!
• THERMOPILE NEEDS A
MINIMUM 325mV.
• PLUGGED BURNER ORIFICE.
TROUBLE SHOOTING THE GAS CONTROL SYSTEM
HONEYWELL MILLIVOLT VALVE