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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 AUX SET button
simultaneously to enter into the Fault Code Display Mode. The Zoneline will then display all active Fault codes
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The Fault Code Display Mode will display all Fault codes 3 times and then after 30 additional seconds the
Zoneline reverts to OFF mode. Pressing AUX will clear the 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
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Is ACTIVE
Fault Reset
Time
F1
Indoor fan fault: Fan motor is
not moving at commanded
speed after 90 seconds of drive
voltage.
No Resistance heating, fan, heat
pump or cooling available.
Fault clears
after 10
minutes.
F2
Outdoor fan fault: Fan motor
is not moving at commanded
speed after 90 seconds of drive
voltage.
No heat pump or cooling
available. Resistance heating
and fan only.
Fault clears
after 10
minutes.
F3
([WHUQDOWKHUPRVWDWZLULQJ
:
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.
1RHȺHFW
Fault clears
after 3
minutes.
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