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Main flame not established following 10 second pilot flame TFI. Air Flow, Fireye indicators on.
— Run check switch in check position.
— Inadequate main fuel supply.
— Defective main fuel valve.
— Main burner improperly adjusted.
— Broken wire, loose connection or wiring error.
— Bent tab on bottom of control.
— Replace 70D30 control.
Main flame lights and then goes out. Air Flow indicator on.
— Main flame and pilot blown out.
— Limit-operating control circuit (terminal L1-3) or running interlock circuit (terminals 3-P)
opens momentarily.
Main flame lights normally, but goes out when pilot flame is shut off. Air flow indicator on.
Control locks out.
— Flame scanner does not see main flame.
— Main burner improperly adjusted.
Pilot flame does not shut off following main flame TFI. Pilot connected to terminal 5. Air flow,
Fireye indicators on.
— Pilot valve stuck open.
— Wiring error.
— Replace 70D30 control.
Flame signal drops off while main burner fires. Air Flow indicator on Fireye indicator goes off.
— Main burner improperly adjusted.
— Flame scanner loses sight of flame.
— Control or scanner subjected to excessive temperature.
Main fuel valve does not shut off when operating control opens. Fireye indicator on.
— Main fuel valve stuck open.
— Wiring error.
Burner, Blower motor does not stop following post purge. All indicators off.
— Defective motor contactor.
— Wiring error.
Note: If operating control recloses during the post purge period, a complete restart is initiated. Do
not momentarily depress the lockout reset button to recycle the unit because it will cause some units
to lockout. Open and reclose the burner control switch instead.
Summary of Contents for D30 Series
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