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Fault Code
Number
Fault Meaning
E
ȹ
ect on operation
Z
hile fault
is ACTIVE
Fault reset
time
F6
Compressor fault - No
temperature change has been
detected after 1 minute of
running.
No e
Ⱥ
ect
Fault clears
after 3
minutes.
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
Software fault
No e
Ⱥ
ect
F9
Indoor coil freeze fault - The
temperature of the indoor coil
has fallen below the freeze
threshold of 34°F.
The compressor is shut down
until the coil temperature
recovers.
Fault clears
once
indoor coil
temperature
rises above
50°F.
F10
Heat pump over-temp 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
indoor coil
temperature
drops below
122°F.
F11
Inlet air temp - Indoor air
thermistor warmer than 95°F.
Shut o
Ⱥ
compressor and
resistance heat operation until
inlet thermistor temperature
drops below 85°F.
Fault clears
once air
temperature
drops below
85°F.
F12
UI board fault - The main
board does not detect the user
interface board.
No e
Ⱥ
ect
Fault clears
once UI
board is
detected.
F13
Heater air
À
ow fault - The main
board detects too low of indoor
fan speed.
No resistance heat or heat pump
available.
Fault clears
after
X
minutes.