Power cycle the heater, in an attempt to clear the
“HF” code. IF power cycling clears to the “HF” code
and the heater fires, drop the temperature to
suspend heating, IF “HF” reappears, go to step 10B.
Call for heat and test gas valve
Power cycle heater
Step 10A
43
“HF” (heat or flame sensed) will occur if flame is sensed when the gas valve is off, the
control will go into lockout. The blower will continuously run until corrected. When
corrected, control will run blower for 5 seconds then restart heater after 2 minutes.
Press the mode button to toggle the heater and
call for heat. IF 24VAC is not present at gas valve
AND manifold pressure is present, gas valve is
defective and needs to be replaced. Otherwise,
replace the ICB (pg. 25).
10. Service LED ON: “HF” Code
OFF
ON
Step 10B
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