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Fault Code
Number
Fault Meaning
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is ACTIVE
Fault reset
time
F7
Reversing valve fault:
Temperature change not
happening as control expects
after 1 minute of running.
No cooling or heat pump
operation. Resistance heating or
fan only.
Fault clears
after 3
minutes.
F8
6RIWZDUHIDXOW
1RHȺHFW
F9
Indoor coil freeze fault: The
temperature of the indoor coil
has fallen below the freeze
threshold 34°F.
The compressor is shut down
untilthe coil temperature
recovers.
Fault clears
once the
indoor coil
temperature
rises above
50°F.
F10
Heat pump over-temperature
fault: The temperature of the
indoor coil is over 131°F.
The outdoor fan motor is shut
down until the coil temperature
recovers.
Fault clears
once the
indoor coil
temperature
drops below
122°F.
F11
Inlet air temperature: Indoor air
thermistor warmer than 95°F.
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resistance heat operation until
inlet thermistor temperature
drops below 85°F.
Fault clears
once the air
temperature
drops below
85°F.
F12
UI board fault: The main
board does not detect the user
interface board.
1RHȺHFW
Fault clears
once the
UI board is
detected.
F13
+HDWHUDLUÀRZIDXOW
: The main
board detects too low of indoor
fan speed.
No resistance heat or heat pump
available.
Fault clears
after 10
minutes.
F14*
Make up air module fan fault
1RHȺHFW
F15*
Make up air module
compressor fault
1RHȺHFW
F16*
Make up air module
communications fault
1RHȺHFW
F17
Outlet air thermistor fault: The
outlet thermistor is not reading
valid temperatures, thermistor
is open, not plugged in or is
shorted.
No resistance heat.
Fault clears
when the
thermistor
valve is in
range.
F18
Outlet air temperature
overheat: The outlet thermistor
is reading a temperature above
170°F.
No resistance heat.
Fault clears
when
thermistor
reads below
85°F.
* Future fault codes
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