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Troubleshooting Tips... Before you call for service
FAULT CODES - Press and hold MODE, then press AUX
Fault Code
Fault Meaning
Numbers
2
3
External thermostat wiring. Applied signal is not valid and has been constant for
temperatures.
5
Outside thermistor fault.
One of the outside thermistors is not reading valid temperatures.
running.
7
minute of running.
Software fault.
minutes.
N/A
Outlet thermistor failure. Fault clears when thermistor reads value other than short
circuit or open circuit.
temperature drops below threshold.
fan operation and check unit/ductwork for blockage.
23
Make-up Air Module Fault. Fan is not operating as expected
25
27
clears when readings are valid.
invalid. Fault clears when readings are valid.
are valid.
running normally.
Effective on system operation while
fault is active
No resistance heating, fan, heating pump or
cooling available.
No heat pump or cooling available.
Resistance heating and fan only.
No external control of fans, heat and cooling
internal control operation only.
No cooling or heat pump operation available.
Resistance heating and fan only.
No cooling or heat pump operation available.
Resistance heating and fan only.
No effect.
No cooling or heat pump operation available.
Resistance heating and fan only.
No effect.
temperature recovers.
temperature recovers.
Heat pump and resistance heating are shut
down and restarted when the indoor ambient
temperature cools sufficiently.
No effect.
No resistance heating available.
N/A
No resistance heating available.
No resistance heating available.
No resistance heating available.
No effect
No effect
control when in cooling operation
operation. Modifies defrost termination target
cycles.
allows compressor to restart
49-5000640 Rev. 1
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