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Service Facts
7 Flash Fault LED
DEFINITION: External Gas
Valve Circuit Error (24 volts is
present when it should not be
present)
Scroll through
User Interface to
View number 1 of
Last 4 Faults
User Interface
shows EXT GV
ERR?
Turn Comfort
Control to "OFF"
position
Is 24VAC nominal voltage
present at gas valve connections
Correct wiring
to chassis ground?
YES
Check operation
Red wire to Ground
Blue Wire to Ground
NO
Replace IFC
UHM-DHM-SF-1V-EN
49
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