18
£
Zero volts at terminals 3-L2. All indicators off.
— Fuel valve proof of closure switch open (or jumper wire not installed at terminals 13-3).
— Bent tab on bottom of control.
— Broken wire, loose connection or wiring error.
— Replace 70D30 control.
Burner, Blower motor does not start. All indicators off.
— Motor electrical power off.
— Blown fuse or tripped circuit breaker.
— Broken wire, loose connection or wiring error.
— Defective motor or motor contactor.
— Bent tab on bottom of control.
— Replace 70D30 control if no voltage at terminals M-L2., (and control is
not
in “lockout”).
— Control is in “LOCKOUT,” depress reset button.
Burner, Blower motor starts. Air flow indicator off.
— Running interlock circuit open (terminals 3-P).
— Broken wire, loose connection or wiring error.
— Bent tab on bottom of control.
— Replace 70D30 control.
Burner, Blower motor runs. Air flow and Fireye indicators on (controls locks out).
— Flame scanner is detecting actual flame.
— Replace flame scanner or correct scanner wiring.
— Replace 72D series amplifier module.
— Replace 70D30 control.
Pilot not energized at the end of purge. Air Flow indicator on, TFI and FIREYE indicators off.
— Low fire start switch open (or jumper wire not installed at terminals M-D).
— Broken wire, loose connection or wiring error.
— Bent tab on bottom of control.
— Replace 70D30 control.
Pilot flame not established. Air Flow, TFI indicators on. Fireye indicator off.
— Defective pilot valve, ignition transformer, electrode or adjustment.
— Improper gas pressure or burner adjustment.
— Broken wire, loose connection or wiring error.
— Bent tab on bottom of control.
— Replace 70D30 control.
Pilot flame lights, but is not detected. Air Flow, TFI indicators on. Fireye indicator off. (No test
jack voltage).
— Scanner does not see adequate pilot flame.
— Broken scanner wire, loose connection or wiring error.
— Bent tab on bottom of control.
— Replace 72D series amplifier module.
— Replace flame scanner.
— Replace 70D30 control.
— With UV units, remove factory installed grounding wire (if present) from terminal S2 on the
wiring base.
Summary of Contents for D30 Series
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