DEFINITION:
Igniter Relay Fault – The control board has sensed
that the igniter relay has stuck closed
igniter Fault – The control board has sensed that
the igniter circuit is open or shorted.
Verify igniter harness is
not damaged and
connectors are ght
Disconnect igniter
and check resistance
Is resistance
reading between 37
– 70 ohms?
(at ~75F)
NO
Replace igniter.
Check operaon
YES
6.3 Fault Code
Igniter is good
Does igniter
glow?
Make a call for
1 stage heang
Igniter is good
Replace IFC, igniter relay has failed
YES
YES
Is 120 VAC
measured between
IGN-H and IGN-N?
Replace IFC, igniter
relay has failed
NO
Disconnect electrical
power to the furnace
NO
st
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