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TROUBLESHOOTING
Control Board
Fault Code
LED Display
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
2
51*
52
Transmitted Climate
Thermostat Fault
Talk Message
Board detected a high current
E35
HIGH CURRENT
condition.
The control encountered an
E36
STARTUP ERROR
abnormal condition during the
startup procedure.
Indicates the control board may
E37
OD CTRL FAIL4
need to be replaced.
The control has detected a voltage
E38
COMP VOLTAGE
related issue with the compressor.
Indicates the control board may
E39
OD CTRL FAIL5
need to be replaced.
Control determines that its
E40
COMP MISMATCH
compressor requirement is different
than the compressor capability.
The control has detected a low
E41
LOW REFRIGERANT
refrigerant condition.
Control detects a low power supply
E42
LOW LINE VOLT
voltage condition.
Control detects a high power
E43
HIGH LINE VOLT
supply voltage condition.
The control detects the outdoor
temperature outside recommended
E44
OP TEMP RANGE
operational range. Unit may
continue to operate normally.
The control is unable to start the
Cooling mode test because indoor
E45
NO COOLING TEST
heat has been turned on by
thermostat. Please set thermostat
to off position.
The control is unable to sart the
Heating mode test becaue indoor
E46
NO HEATING TEST
heat has been turned on by
thermostat. Please set thermostat
to off position.
The control is unable to start the
System Verification test because
E47
NO SYS VER TEST
indoor heat has been turned on by
thermostat. Please set thermostat
to off position.
The control is unable to enter the
Pump Down Mode because indoor
E48
NO PUMP DOWN
heat has been turned on by
thermostat. Please set thermostat
to off position.
The control is unable to enter
Charging Mode because indoor
E49
NO CHARGE MODE
heat has been turned on by
thermostat. Please set thermostat
to off position.
This indicates there is a voltage
issue on the control board. See
E50
LINE VOLT CTRL
service manual for troubleshooting
information.
This indicates potential
communication issues have been
E51
OD COMM ERROR
detected by the outdoor control
board.
This error indicates the equipment
is experiencing frequent
compressor faults. Control has
-
COMP FAIL MINOR
determined continued operation is
acceptable. This indicates they may
be a problem with the equipment.
OUTDOOR UNIT ERROR CODES
Probable Causes
● Check installation clearances.
● Check the opening of stop valve, should be full
● Short circuit condition
open; Repair/replace if needed
● Stop valve not completely open
● Check refrigerant charge level; Adjust if
● Overcharge
needed
● Faulty control board
● Replace control board if necessary
● Faulty compressor
● Check the compressor; Repair/replace if
needed.
● Blocked/restricted condenser coil
● Check and clean condenser coil and/or lines
and/or lines
● Check the wire between control board and
● The compressor wire is lost phase
compressor
● Inconsistent compressor load
● Replace control board if necessary
● Faulty control board
● Outdoor fan motor not connected
● Check wiring from outdoor fan motor to control
properly
board; Repair if needed
● Faulty control board
● Replace control board if necessary
● Correct low/high line voltage condition; Contact
● High or low voltage from supply
local utility if needed
● The compressor wire is lost phase
● Check the wire between control board and
● Faulty control board
compressor
● Replace control board if necessary
● Thermistors inoperable or improperly
● Check the connection to thermistors;
connected
Repair/replace if needed
● Faulty control board
● Replace control board if necessary
● Check Bluetooth® Shared Data Loader
● Bluetooth® Shared Data Loader
BTSDL01 data vs. air conditioner model
BTSDL01 not correct
● Verify control board size vs. air conditioner
● Control board mismatch
model; Replace control board if necessary
● Test for system leaks using leak test procedure
● Refrigerant leak
● Check refrigerant charge level; Adjust if
● Low refrigerant charge
needed
● Thermisters inoperable or not
● Checkthe connection to thermistor;
properly connected
Repair/replace if needed
● Check circuit breakers and fuses; Replace if
needed
● Verify unit is connected to power supply as
● Low line voltage supply
specified on rating plate
● Correct low line voltage condition; Contact
local utility if
needed
● Verify unit is connected to power supply as
specified on rating plate
● High line voltage supply
● Correct high line voltage condition; Contact
local utility
if needed
● Ambient air conditions too high or
● Cycle power; re-try during usable ambient
low
temperature range
● Heat provided by secondary heating
● Turn off heater using thermostat before
source
running AHRI mode
● Heat provided by secondary heating
● Turn off heater using thermostat before
source
running AHRI mode
● Heat provided by secondary heating
● Turn off heater using thermostat before
source
operation
● Heat provided by secondary heating
● Turn off heater using thermostat before
source
operation
● Heat provided by secondary heating
● Turn off heater using thermostat before
source
operation
● Correct low/high line voltage condition; Contact
● High or low voltage from supply
local utility if needed
● Faulty control board
● Replace control board if necessary
● Check communication wiring; Repair as
● Communication wiring disconnected
needed
● Check the opening of stop valve, should be full
open; Repair/replace if needed
● Stop valve not completely open
● Check the wire between control board and
● The compressor wire is lost phase
compressor
● Compressor motor failure
● Inspect compressor motor for proper function;
Replace if necessary
Corrective Actions
67
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