2626
trouBleShootIng
ClimateTalk
Fault Code
PCB LED
Display
Transmitted ClimateTalk
Message
Thermostat Fault Probable Causes Corrective Actions
12 E12 OD CTRL FAIL1 Indicates a general memory error.
• High electrical noise
• Faulty control board
• Replace control board if necessary
13 E13
HI PRESSURE C
(C = CRITICAL)
This error indicates the equipment
is experiencing frequent high pres-
sure faults.
• Blocked/restricted heat pump coil and/
or lines
• Stop valve not completely open
• Overcharge
• Outdoor fan not running
• High pressure switch (HPS) inoperable
• Faulty indoor and outdoor EEV coil
• Faulty indoor and outdoor EEV
• Faulty control board
• Check and clean heat pump coil and/or lines
• Check the opening of stop valve, should be full open;
Repair/replace if needed
• Check refrigerant charge level; Adjust if needed
• Check outdoor fan motor & wiring; Repair/replace if
needed
• Check indoor and outdoor EEV; Replace if needed
• Check indoor and outdoor EEV coil; Replace if needed
• Replace control board if necessary
14 -
HI PRESSURE M
(M = MINOR)
This error indicates the equipment
is experiencing frequent high pres-
sure faults. Control has determined
continued operation is acceptable.
This indicates they may be a prob-
lem with the equipment.
• Blocked/restricted heat pump coil and/
or lines
• Stop valve not completely open
• Overcharge
• Outdoor fan not running
• High pressure switch (HPS) inoperable
• Faulty indoor and outdoor EEV coil
• Faulty indoor and outdoor EEV
• Faulty control board
• Check and clean heat pump coil and/or lines
• Check the opening of stop valve, should be full open;
Repair/replace if needed
• Check refrigerant charge level; Adjust if needed
• Check outdoor fan motor & wiring; Repair/replace if
needed
• Check indoor and outdoor EEV; Replace if needed
• Check indoor and outdoor EEV coil; Replace if needed
• Replace control board if necessary
15 E15 LOW PRESSURE C
This error indicates the equipment
is experiencing frequent low pres-
sure faults.
• Stop valve not completely open
• Restriction in refrigerant lines
• Low refrigerant charge
• Refrigerant leak
• Low pressure sensor inoperable or not
properly connected
• Indoor fan motor not functioning correctly
• Faulty indoor and outdoor EEV coil
• Faulty indoor and outdoor EEV
• Faulty control board
• Check the opening of stop valve, should be full open;
Repair/replace if needed
• Check for restrictions in refrigerant line; Repair/replace
if needed
• Check refrigerant charge level; Adjust if needed
• Test for system leaks using leak test procedure
• Check the connection to low pressure sensor; Repair/
replace if needed
• Check indoor and outdoor EEV; Replace if needed
• Check indoor and outdoor EEV coil; Replace if needed
• Check indoor blower motor & wiring; Repair/replace if
needed
• Replace control board if necessary
16 - LOW PRESSURE M
This error indicates the equipment
is experiencing frequent low pres-
sure faults. Control has determined
continued operation is acceptable.
This indicates they may be a prob-
lem with the equipment.
• Stop valve not completely open
• Restriction in refrigerant lines
• Low refrigerant charge
• Refrigerant leak
• Low pressure sensor inoperable or not
properly connected
• Indoor fan motor not functioning correctly
• Faulty indoor and outdoor EEV coil
• Faulty indoor and outdoor EEV
• Faulty control board
• Check the opening of stop valve, should be full open;
Repair/replace if needed
• Check for restrictions in refrigerant line; Repair/replace
if needed
• Check refrigerant charge level; Adjust if needed
• Test for system leaks using leak test procedure
• Check the connection to low pressure sensor; Repair/
replace if needed
• Check indoor and outdoor EEV; Replace if needed
• Check indoor and outdoor EEV coil; Replace if needed
• Check indoor blower motor & wiring; Repair/replace if
needed
• Replace control board if necessary
17 E17 COMPRESSOR FAIL
This error indicates the equipment
is experiencing frequent compres-
sor faults.
• 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 necessary
18 E18 OD CTRL FAIL2
Indicates the control board may
need to be replaced.
• Outdoor fan motor not connected properly
• Faulty control board
• Electrical Noise
• Check wiring from Outdoor fan motor to control board;
Repair if needed
• Replace control board if necessary
19 E19 PCB OR FAN FAIL
This error indicates the equipment
is experiencing frequent outdoor
control board and/or motor faults.
• Obstruction in fan rotation
• Outdoor fan motor not connected properly
• Outdoor fan not running
• Faulty control board
• Electrical Noise
• Check and clean grille of any debris
• Check wiring from Outdoor fan motor to control board;
Repair if needed
• Check outdoor fan motor & wiring; Repair/replace if
needed
• Replace control board if necessary
20 E20 EEV OPEN CKT EEV coil is not connected.
• Outdoor EEV coil is not connected
• Faulty outdoor EEV coil
• Check outdoor EEV coil connection
Repair/replace as needed
21 E21 EEV CTRL FAIL
This error indicates the equipment
is experiencing frequent low dis-
charge superheat faults.
• Thermistors inoperable or improperly
connected
• Faulty indoor and outdoor EEV coil
• Faulty indoor and outdoor EEV
• Over charge
• Faulty pressure sensor
• Faulty control board
• Check the connection to thermistors; Repair/replace if
needed
• Check indoor and outdoor EEV coil; Repair/replace if
needed
• Check indoor and outdoor EEV; Replace/repair if needed
• Check refrigerant charge level; Adjust if needed
• Check pressure sensor; Repair/replace if needed
• Replace control board if necessary
22 E22 HI DISCH TEMP
This error indicates the equipment
is experiencing frequent high
discharge temperature faults.
Discharge thermistor is not put in
correct position.
• Discharge thermistor inoperable or
improperly connected
• Discharge thermistor is put in incorrect
position or off
• The compressor enclosure temperature
is too high
• Low refrigerant charge
• Overcharge
• Faulty compressor
• Check discharge thermistor resistance and connections;
Repair/replace as needed
• Check discharge thermistor position
• Check refrigerant charge level; Adjust if needed
• Check the compressor; Repair/replace if needed
23 E23 DISCH TEMP FAIL
The control has detected that the
Discharge Temperature Sensor is
out of range.
• Discharge thermistor inoperable or
improperly connected
• Check discharge thermistor resistance and connections;
Repair/replace as needed
24 E24 HPS OPEN The high pressure switch is open. • High pressure switch (HPS) inoperable
• Check resistance on HPS to verify operation; Replace
if needed
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