2727
trouBleShootIng
ClimateTalk
Fault Code
PCB LED
Display
Transmitted ClimateTalk
Message
Thermostat Fault Probable Causes Corrective Actions
25 E25 AIR SENSOR FLT
The outdoor air temperature sensor
is open or shorted.
• Faulty outdoor thermistor sensor or
disconnect
• Inspect and test sensor; Replace sensor if needed
26 E26 PRESSURE SENSOR
The control determines that the
pressure sensor is not reacting
properly.
• Pressure sensor inoperable or not prop-
erly connected
• Check the connection to pressure sensor; Repair/replace
if needed
27 E27 COIL TEMP FAIL1
The control has detected that the
Outdoor Coil Defrost Temperature
Sensor is out of range.
• Outdoor defrost thermistor inoperable or
not properly connected
• Check the connection to OD defrost thermistor; Repair/
replace if needed
28 E28 COIL TEMP FAIL2
The control has detected that the
Outdoor Coil Temperature Sensor is
out of range.
• Outdoor coil thermistor inoperable or not
properly connected
• Check the connection to OD coil thermistor; Repair/
replace if needed
29 E29 LIQ TEMP FAIL
The control has detected that the
Liquid Temperature Sensor is out
of range.
• Liquid thermistor inoperable or not prop-
erly connected
• Check the connection to liquid thermistor; Repair/replace
if needed
30 E30 OD CTRL FAIL3
Indicates the control board may
need to be replaced.
• Wiring to control board disconnected
• Faulty control board
• Electrical Noise
• Check wiring to control board; Repair as needed
• Replace control board if necessary
32 E32 HI TEMP CTRL1
This error indicates the equipment
is experiencing high temperature
faults on the outdoor control board.
• Ambient air conditions too high
• Stop valve not completely open
• Cooling bracket screw(s) missing or not
properly fastened <3.5 - 5.0 ton only>
• No or poor thermal grease coating
between cooling plumbing and cooling
bracket on control board <3.5 - 5.0 ton
only>
• No ow or limited ow through control
board cooling circuit (potential restriction
in line or low refrigerant) <3.5 - 5.0 ton
only>
• Cycle power; re-try during usable ambient temperature
range
• Check grease applying condition <3.5 - 5.0 ton only>
• Check screw tightening condition <3.5 - 5.0 ton only>
• Check for restriction in line
• Check refrigerant charge level; Adjust if needed
• Check the opening of stop valve, should be full open;
Repair/replace if needed
33 - HI TEMP CTRL2
This error indicates the equipment
is experiencing high temperature
faults on the outdoor control board.
Control has determined continued
operation is acceptable. This indi-
cates they may be a problem with
the equipment.
• Ambient air conditions too high
• Stop valve not completely open
• Cooling bracket screw(s) missing or not
properly fastened <3.5 - 5.0 ton only>
• No or poor thermal grease coating
between cooling plumbing and cooling
bracket on control board <3.5 - 5.0 ton
only>
• No ow or limited ow through control
board cooling circuit (potential restriction
in line or low refrigerant) <3.5 - 5.0 ton
only>
• Cycle power; re-try during usable ambient temperature
range
• Check grease applying condition <3.5 - 5.0 ton only>
• Check screw tightening condition <3.5 - 5.0 ton only>
• Check for restriction in line
• Check refrigerant charge level; Adjust if needed
• Check the opening of stop valve, should be full open;
Repair/replace if needed
34 E34 CURRENT SPIKE
Board detected a high current con-
dition. This indicates the potential
for a short circuit.
• Current spike in supply
• Stop valve not completely open
• The compressor wire is lost phase
• Faulty control board
• Faulty compressor
• Check power supply for in-rush current during start-up or
steady state operation
• Check the opening of stop valve, should be full open;
Repair/replace if needed
• Check the wire between control board and compressor
• Replace control board if necessary
• Check the compressor; Repair/replace if needed
35 E35 HIGH CURRENT
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 abnor-
mal condition during the startup
procedure.
• Blocked/restricted heat pump coil and/
or lines
• The compressor wire is lost phase
• Inconsistent compressor load
• Faulty control board
• Check and clean heat pump 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 control 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
needed
• Replace control board if necessary
40 E40 COMP MISMATCH
Control determines that its compres-
sor requirement is different than the
compressor capability.
• Memory card not correct
• Control board mismatch
• Check memory card data vs. heat pump model
• Verify control board size vs. heat pump model; Replace
control board if necessary
41 E41 LOW REFRIGERANT
The control has detected a low
refrigerant condition.
• Refrigerant leak
• Low refrigerant charge
• Thermistors inoperable or not properly
connected
• Test for system leaks using leak test procedure
• Check refrigerant charge level; Adjust if needed
• Check the connection to thermistor; Repair/replace 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 specied on
rating plate
• Correct low line voltage condition; Contact local utility if
needed
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