Daikin UWL040B5 - Page 47

46
S/N Error Code Symptom Possible Cause Solution
48
The LED indicator
of the unit displays
ER67 and the
wired controller
displays 67
Discharge
temperature #3
is too high
The heat exchanger needs cleaning (cooling). Check and troubleshoot the unit.
The electronic expansion valve is not opened
as expected (heating).
Check and troubleshoot the electronic expansion
valve.
The water temperature is too high.
Change the setting for return water temperature (to
be performed by service personnel).
Insufcient refrigerant or leakage. Replenish a proper amount of refrigerant.
TH3 temperature sensor is broken down. see Item 26 in the table.
49
The LED indicator
of the unit displays
ER68 and the
wired controller
displays 68
Discharge
temperature #4
is too high
The heat exchanger needs cleaning (cooling). Check and troubleshoot the unit.
The electronic expansion valve is not opened
as expected (heating).
Check and troubleshoot the electronic expansion
valve.
The water temperature is too high.
Change the setting for return water temperature
(to be performed by service personnel).
Insufcient refrigerant or leakage. Replenish a proper amount of refrigerant.
TH4 temperature sensor is broken down. see Item 27 in the table.
50
The LED indicator
of the unit displays
ER69 and the
wired controller
displays 69
Refrigerant
leakage in #3
Low pressure sensor failure. Replace the low pressure sensor.
Insufcient refrigerant. Add refrigerant.
51
The LED indicator
of the unit displays
ER70 and the
wired controller
displays 70
Refrigerant
leakage in #4
Low pressure sensor failure. Replace the low pressure sensor.
Insufcient refrigerant. Add refrigerant.
52
The LED indicator
of the unit displays
ER71 and the
wired controller
displays 71
Low pressure
sensor
malfunction of
#3
Three lines of the low pressure sensor is
incorrectly connected.
Reconnect the connecting lines of the low
pressure sensor.
The low pressure sensor is shorted/ open.
Repair or replace the lines of the low pressure
sensor.
The Low pressure sensor has broken down. Replace the low pressure sensor.
There is something wrong with the test circuit
of the low pressure sensor in the control
module.
Replace the control module.
53
The LED indicator
of the unit displays
ER72 and the
wired controller
displays 72
Low pressure
sensor
malfunction of
#4
Three lines of the low pressure sensor is
incorrectly connected.
Reconnect the connecting lines of the low
pressure sensor.
The low pressure sensor is shorted/ open.
Repair or replace the lines of the low pressure
sensor.
The Low pressure sensor has broken down. Replace the low pressure sensor.
There is something wrong with the test circuit
of the low pressure sensor in the control
module.
Replace the control module.
54
The LED indicator
of the unit displays
ER78 and the
wired controller
displays 78
Communication
failure for all
slave units
1. The Bin/Ain communication line of the
master unit has broken off.
Reconnect the communication line to the Bin/Ain
port and screw down the wire terminal.
2. One of the A/B communication lines is
connected incorrectly.
Check the communication line.
3. The Bin/Ain port of the master unit has
broken down.
Replace the control panel of the master unit.
55
The digital pipe of
the unit displays
ERRO
Dialing setting
error
Dialing setting error on the module.
According to the circuit diagram, complete the
dialing setting again.