36
35 E35 HIGH CURRENT Control Board detected a high current condition.
● Short circuit condition
● Stop valve not completely open
● Overcharge
● Faulty control board
● Faulty compressor
● Check installation clearances.
● Check the opening of stop valve, should be full open;
Repair/replace if needed
● Check refrigerant charge level; Adjust if needed
● Replace control board if necessary
● Check the compressor; Repair/replace if needed.
36 E36 STARTUP ERROR
The control encountered an abnormal condition
during the startup procedure.
● Blocked/restricted condenser coil and/or lines
● The compressor wire is lost phase
● Inconsistent compressor load
● Check and clean condenser coil and/or lines
● Check the wire between control board and compressor
● Replace control board if necessary
37 E37 OD CTRL FAIL4
Indicates the control board may need to be
replaced.
● Outdoor fan motor not connected properly
● Faulty control board
● Check wiring from Outdoor fan motor to control board;
Repair if needed
● Replace control board if necessary
38 E38 COMP VOLTAGE
The con
trol has detected a voltage related issue
with the compressor.
● High or low voltage from supply
● The compressor wire is lost phase
● Faulty control board
● Correct low/high line voltage condition; Contact local
utility if needed
● Check the wire between control board and compressor
● Replace control board if necessary
39 E39 OD CTRL FAIL5
Indicates the control board may need to be
replaced.
● Thermistors inoperable or improperly connected
● Faulty control board
● Check the connection to thermistors; Repair/replace if
● Replace control board if necessary
40 E40 COMP MISMATCH
Control determines that its compressor requirement
is different than the compressor capability.
● Memory card not correct
● Control board mismatch
● Check memory card data vs. air conditioner model
● Verify control board size vs. air conditioner model;
Replace control board if necessary
41 E41 LOW REFRIGERANT The control has detected a low refrigerant condition.
● Refrigerant leak
● Low refrigerant charge
● Test for system leaks using leak test procedure
● Check refrigerant charge level; Adjust if needed
42 E42 LOW LINE VOLT
Control detects a low power supply voltage
condition.
● Low line voltage supply
● Check circuit breakers and fuses; Replace if needed
● Verify unit is connected to power supply as specified on
rating plate
● Correct low line voltage condition; Contact local utility if
43 E43 HIGH LINE VOLT
Control detects a high power supply voltage
condition.
● High line voltage supply
● Verify unit is connected to power supply as specified on
rating plate
● Correct high line voltage condition; Contact local utility if
44 E44 OP TEMP RANGE
The control detects the outdoor temperature
outside recommended operational range. Unit may
continue to operate normally.
● Ambient air conditions too high or low
● Cycle power; re-try during usable ambient temperature
range
45 E45 NO COOLING TEST
The control is unable to start the Cooling mode test
because indoor heat has been turned on by
thermostat. Please set thermostat to off position.
● Heat provided by secondary heating source
● Turn off heater using thermostat before running AHRI
mode
46 E46 NO HEATING TEST
The control is unable to start the Heating mode test
because indoor heat has been turned on by
thermostat. Please set thermostat to off position.
● Heat provided by secondary heating source
● Turn off heater using thermostat before running AHRI
mode
47 E47 NO SYS VER TEST
The control is unable to start the System
Verification test because indoor heat has been
turned on by thermostat. Please set thermostat to
off position.
● Heat provided by secondary heati
ng source ● Turn off heater using thermostat before operation
48 E48 NO PUMP DOWN
The control is unable to enter the Pump Down
Mode because indoor heat has been turned on by
thermostat. Please set thermostat to off position.
● Heat provided by secondary heating source ● Turn off heater using thermostat before operation
49 E49 NO CHARGE MODE
The control is unable to enter Charging Mode
because indoor heat has been turned on by
thermostat. Please set thermostat to off position.
● Heat provided by secondary heating source ● Turn off heater using thermostat before operation
50 E50 LINE VOLT CTRL
This indicates there is a voltage issue on the
control board. See service manual for
troubleshooting information.
● High or low voltage from supply
● Faulty control board
● Correct low/high line voltage condition; Contact local
● Replace control board if necessary
This indicates potential communication issues have
been detected by the outdoor control board.
● Communication wiring disconnected ● Check communication wiring; Repair as needed
52 - COMP FAIL MINOR
This error indicates the equipment is experiencing
frequent compressor faults. Control has determined
continued operation is acceptable. This indicates
they may be a problem with the equipment.
● Stop valve not completely open
● The compressor wire is lost phase
● Compressor motor failure
● Check the opening of stop valve, should be full open;
Repair/replace if needed
● Check the wire between control board and compressor
● Inspect compressor motor for proper function; Replace if
Transmitted
ClimateTalk Message
Thermostat Fault Probable Causes Corrective Actions
(*1) Network Communication Error (Refer to “NETWORK TROUBLESHOOTING”
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