DEFINITION: External Gas Valve
Circuit Error (24 volts is present
when it should not be present)
Is 24 VAC nominal voltage present
between Red lead at gas valve
connec!on to chassis ground?
Turn Comfort
Control to “OFF”
posi!on
Correct wiring
Check opera!on
YES
Replace IFC
NO
7.1 Fault Code
DEFINITION: The HLO (High Limit
Out) relay on the IFC is stuck ON
Is 24 VAC nominal voltage
measured from HLO
to common?
Turn Comfort
Control to “OFF”
posi!on
Cycle power
to the unit.
YES
Replace IFC
NO
7.2 Fault Code
Does the error clear?
Verify Opera!on
NO
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