Residential Air Conditioners and Heat Pumps Using R-22 and Puron® Refrigerant: Application Guideline and Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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Table 14 – Status Codes
OPERATION FAULT
AMBER LED
FLASH CODE
POSSIBLE CAUSE AND ACTION
Standby – no call for unit
operation
None On solid, no flash Normal operation
Cool/Heat Operation None 1, pause Normal operation
System Communications
Failure
16
Communication with user interface lost. Check wiring to UI, indoor and
outdoor units
High Pressure Switch
Open
31
High pressure switch trip. Check refrigerant charge, outdoor fan operation
and coils for airflow restrictions.
Low Pressure Switch
Open
32 Low pressure switch trip. Check refrigerant charge and indoor air flow
Control Fault 45 Outdoor unit control board has failed. Control board needs to be replaced.
Brown Out
(24 v)
46
The control voltage is less than 15.5v for at least 4 seconds. Compressor
and fan operation not allowed until control voltage is a minimum of 17.5v.
Verify control voltage.
Outdoor Air Temp Sensor
Fault
53
Outdoor air sensor not reading or out of range. Ohm out sensor and check
wiring
Outdoor Coil Sensor Fault 55 Coil sensor not reading or out of range. Ohm out sensor and check wiring
Thermistors out of range 56
Improper relationship between coil sensor and outdoor air sensor. Ohm out
sensors and check wiring.
Thermal Cutout 72
Compressor voltage sensed after start–up, then absent for 10 consecutive
seconds while cooling demand exists. Possible causes are internal
compressor overload trip or loss of high voltage to compressor without loss
of control voltage.
Contactor Shorted 73
Compressor voltage sensed when no demand for compressor operation
exists. Contactor may be stuck closed or there is a wiring error.
No 230V at Compressor 74
Compressor voltage not sensed when compressor should be starting.
Disconnect may be open or contactor may be stuck open or there is a
wiring error.
Thermal Lockout 82
Thermal cutout occurs in three consecutive cycles. Unit operation locked
out for 4 hours or until 24v power recycled.
Low Pressure Lockout 83
Low pressure switch trip has occurred during 5 consecutive cycles. Unit
operation locked out for 4 hours or until 24v power recycled.
High Pressure Lockout 84
High pressure switch trip has occurred during 5 consecutive cycles. Unit
operation locked out for 4 hours or until 24v power recycled.
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