Daikin UWL-B5 Series Catalogue/Engineering Data page 44

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