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Fault Codes
Fault Code Display Mode
While the Zoneline is in the "OFF" mode, press and hold the fan button with the red auxiliary set button
simultaneously to enter into this mode. The Zoneline will then display all active fault codes held in
memory, showing each one for 3 seconds on/off.
If no codes are present, display will show "--" and ash that every 3 seconds on/off.
Displays all fault codes three times and then after an additional 30 seconds the Zoneline reverts to OFF
mode. Pressing AUX will clear stored faults but it will not exit the fault code menu. Any other button
press takes Zoneline out of this mode.
Fault
Code
Number
Fault Meaning
Effect on Operation
While Fault is ACTIVE
Fault Reset Time
F1 Indoor fan fault: Fan motor not
moving at commanded speed
after 30 seconds of drive voltage.
No resistance heating,
fan, heat pump or cooling
available.
Fault clears after 10
minutes.
F2 Outdoor fan fault: Fan motor
not moving at commanded
speed after 30 seconds of drive
voltage.
No heat pump or cooling
available. Resistance
heating and fan only.
Fault clears after 10
minutes.
F3 External thermostat wiring:
Applied signal is not valid
and has been constant for 30
seconds.
No external control of fans,
heat or cooling. Internal
control operation only.
Clears once a valid
signal is received.
F4 Indoor thermistor fault: One
of the indoor thermistors is not
reading valid temperatures.
Valid range is -10°F to 140°F.
No resistance heating,
fan, heat pump or cooling
available. Fan only.
Clears once a valid
signal is received.
F5 Outdoor thermistor fault: One
of the outdoor thermistors is
not reading valid temperatures.
Valid range is -30°F to 140°F.
No cooling or heat pump
operation. Resistance
heating or fan only.
Clears once a valid
signal is received.
F6 Compressor fault: No
temperature change has been
detected after 1 minute of
running.
No effect. 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 effect
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.
(Continued next page)
Features may vary depending model number throughout this Service Guide.
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