Daikin UAL-A Series - Page 48

47
19
The LED indicator
of the unit displays
ER35 and the wired
controller displays 35
Temperature of discharge air in
#2 is too high
The fan motor has broken down
(cooling)
Check and troubleshoot the unitCirculatory air is shorted (cooling)
The heat exchanger needs cleaning
(cooling)
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
Incomplete defrosting
Change the defrosting parameter
(to be performed by service
personnel)
20
The LED indicator
of the unit displays
ER36 and the wired
controller displays 36
Low pressure of #2
Malfunction of heat exchanger during
heating
Check and troubleshoot the
outdoor unit
Malfunction of motor during heating
Check and troubleshoot the
outdoor motor
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
The electronic expansion valve fails to
provide proper control
Upgrade the modular program
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
TH1 temperature sensor failure
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
TH2 temperature sensor failure
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
TH3 temperature sensor failure
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