Daikin UWL-B5 Series Catalogue/Engineering Data page 46

S/N Error Code
The LED indicator
Over-low
of the unit displays
of water
37 ER55 and the
temperature of
wired controller
condenser
displays 55
The LED indicator
of the unit displays Overload of
38 ER56 and the compressor in
wired controller #1
displays 56
The LED indicator
of the unit displays Overload of
39 ER57 and the compressor in
wired controller #3
displays 57
The LED indicator
of the unit displays Overload of
40 ER58 and the compressor in
wired controller #4
displays 58
The LED indicator
of the unit displays
High pressure of
41 ER59 and the
#4
wired controller
displays 59
The LED indicator
of the unit displays
Low pressure of
42 ER60 and the
#3
wired controller
displays 60
The LED indicator
of the unit displays
Low pressure of
43 ER61 and the
#4
wired controller
displays 61
The LED indicator
of the unit displays
Superheat of #3
44 ER62 and the
is too low
wired controller
displays 62
The LED indicator
of the unit displays
Superheat of #4
45 ER63 and the
is too low
wired controller
displays 63
The LED indicator Suction
of the unit displays temperature
46 ER65 and the sensor
wired controller malfunction of
displays 65 #3
The LED indicator Suction
of the unit displays temperature
47 ER66 and the sensor
wired controller malfunction of
displays 66 #4
Symptom Possible Cause
The temperature of return water is set too low. Change the temperature setting for return water.
TH8 temperature sensor is shorted/ open.
Over current in the compressor has triggered
the overload protector.
Over current in the compressor has triggered
the overload protector.
Over current in the compressor has triggered
the overload protector.
1. Heat exchanger dirty.
2. Blocked of refrigerant filter.
3. Water temperature too high (condenser).
4. Lack of water (condenser).
5. Blocked of water filter (condenser).
6. Too much refrigerant.
7. Failure of high-voltage modular output port. Replace the module.
8. The switch has broken down.
Malfunction of heat exchanger.
Insufficient refrigerant or leakage .
Failure of low-voltage modular input port .
The low pressure sensor has broken down.
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.
The low pressure sensor or temperature
sensor has broken down.
EXV broken down.
TH11 temperature sensor is not properly
plugged or has broken off.
TH11 temperature sensor is shorted/ open.
There is something wrong with the test circuit
of the temperature sensor in the control
module.
TH12 temperature sensor is not properly
plugged or has broken off.
TH12 temperature sensor is shorted/ open.
There is something wrong with the test circuit
of the temperature sensor in the control
module.
Solution
Test whether the resistance of TH8 sensor meets
specification requirements/replace if not.
1. Check whether the electric current parameter
of the overload protector is configured correctly by
referring to the electric circuit.
2. Check whether the resistor of the malfunctioned
compressor meets specification requirements.
1. Check whether the electric current parameter
of the overload protector is configured correctly by
referring to the electric circuit.
2. Check whether the resistor of the malfunctioned
compressor meets specification requirements.
1. Check whether the electric current parameter
of the overload protector is configured correctly by
referring to the electric circuit.
2. Check whether the resistor of the malfunctioned
compressor meets specification requirements.
Check and troubleshoot.
Check and replace.
Tune down the water temperature.
Check and troubleshoot
Clean the water filter.
Release a proper amount of refrigerant.
Replace the pressure switch.
Check and troubleshoot.
Check and replenish refrigerant.
Replace the module.
Replace the pressure sensor.
Check and troubleshoot.
Check and replenish refrigerant.
Replace the module.
Replace the pressure sensor.
Replace
Replace EXV.
Replace
Replace EXV.
Check the control module and replug the
temperature sensor.
Test whether the resistance of TH11 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 TH12 sensor
meets specification requirements/replace if not.
Replace the control module.
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