Daikin UWL030B5 - Trouble shooting Temperature Sensor Issues

43
S/N Error Code Symptom Possible Cause Solution
20
The LED indicator
of the unit displays
ER36 and the
wired controller
displays 36
Low pressure
of #2
Malfunction of heat exchanger. Check and troubleshoot.
Insufcient refrigerant or leakage. Check and replenish refrigerant.
Failure of low-voltage modular input port . Replace the module.
The low pressure sensor has broken down. Replace the pressure sensor.
21
The LED indicator
of the unit displays
ER37 and the
wired controller
displays 37
Superheat of #2
is too low
The low pressure sensor or temperature
sensor has broken down.
Replace
EXV broken down. Replace EXV.
22
The LED indicator
of the unit displays
ER38 and the
wired controller
displays 38
Refrigerant
leakage in #1
Low pressure sensor failure. Replace the low pressure sensor.
Insufcient refrigerant. Add refrigerant.
23
The LED indicator
of the unit displays
ER39 and the
wired controller
displays 39
Refrigerant
leakage in #2
Low pressure sensor failure. Replace the low pressure sensor.
Insufcient refrigerant. Add refrigerant.
24
The LED indicator
of the unit displays
ER40 and the
wired controller
displays 40
Discharge
temperature
sensor
malfunction of
#1
TH1 temperature sensor is not properly
plugged or has broken off.
Check the control module and replug the
temperature sensor.
TH1 temperature sensor is shorted/ open.
Test whether the resistance of TH1 sensor meets
specication requirements/replace if not.
There is something wrong with the test circuit
of the temperature sensor in the control
module.
Replace the control module.
25
The LED indicator
of the unit displays
ER41 and the
wired controller
displays 41
Discharge
temperature
sensor
malfunction of
#2
TH2 temperature sensor is not properly
plugged or has broken off.
Check the control module and replug the
temperature sensor.
TH2 temperature sensor is shorted/ open.
Test whether the resistance of TH2 sensor meets
specication requirements/replace if not.
There is something wrong with the test circuit
of the temperature sensor in the control
module.
Replace the control module.
26
The LED indicator
of the unit displays
ER42 and the
wired controller
displays 42
Discharge
temperature
sensor
malfunction of
#3
TH3 temperature sensor is not properly
plugged or has broken off.
Check the control module and replug the
temperature sensor.
TH3 temperature sensor is shorted/ open.
Test whether the resistance of TH3 sensor meets
specication requirements/replace if not.
There is something wrong with the test circuit
of the temperature sensor in the control
module.
Replace the control module.
27
The LED indicator
of the unit displays
ER43 and the
wired controller
displays 43
Discharge
temperature
sensor
malfunction of
#4
TH4 temperature sensor is not properly
plugged or has broken off.
Check the control module and replug the
temperature sensor.
TH4 temperature sensor is shorted/ open.
Test whether the resistance of TH4 sensor meets
specication requirements/replace if not.
There is something wrong with the test circuit
of the temperature sensor in the control
module.
Replace the control module.
26
The LED indicator
of the unit displays
ER44 and the
wired controller
displays 44
Main pipe
leaving water
temperature
sensor
malfunction
TH5 temperature sensor is not properly
plugged or has broken off.
Check the control module and replug the
temperature sensor.
TH5 temperature sensor is shorted/ open.
Test whether the resistance of TH5 sensor meets
specication requirements/replace if not.
There is something wrong with the test circuit
of the temperature sensor in the control
module.
Replace the control module.
27
The LED indicator
of the unit displays
ER453 and the
wired controller
displays 45
Entering water
temperature
sensor
malfunction of
evaporator
TH6 temperature sensor is not properly
plugged or has broken off.
Check the control module and replug the
temperature sensor.
TH6 temperature sensor is shorted/ open.
Test whether the resistance of TH6 sensor meets
specication requirements/replace if not.
There is something wrong with the test circuit
of the temperature sensor in the control
module.
Replace the control module.