SERVICING
65
Main valve opens
Blower runs after 30
Seconds
Discard old Igniter/flame sensor Assembly
Replace Smart Valve.
Reuse ignitor/flame
sensor assembly
YES
Smart Valve system
OK
Check for output from gas valve to control
board. 19.5 volts min. at Blue 34 wire to
transformer common.
Repair/Replace
harness or gas valve.
Replace control board
YES
NO
YES
YES
Check flame proving circuits and gas
valve
Replace Igniter/flame sensor assembly
and restart trouble shooting sequence
Does main burner light?
correct unit grounding
NO
Verify unit is properly grounded?
Verify flames sense circuit. Remove
power to unit and measure ohms from
pilot hood to tramsformer common. 10
ohms max.
YES
NO
Repair or clean pilot
mounting or
transformer grounding.
YES
NO
Check control board
Check pilot to burner alignment.
Verify that pilot is positioned in front of the
burner carry-over
Correct pilot position
NO
NO
NO
Check gas valve
Verify that pilot adjustment on gas valve
open and adjusted correctly
Open or adjust gas
valve pilot
NO
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