Superheat Of #2 Is Too Low; Refrigerant Leakage In #1 - Daikin UHA075B5 Catalogue/Engineering Data

S/N
The LED indicator of the unit
20 displays ER36 and the wired
controller displays 36
The LED indicator of the unit
21 displays ER37 and the wired
controller displays 37
The LED indicator of the unit
22 displays ER38 and the wired
controller displays 38
The LED indicator of the unit
23 displays ER39 and the wired
controller displays 39
The LED indicator of the unit
24 displays ER40 and the wired
controller displays 40
The LED indicator of the unit
25 displays ER41 and the wired
controller displays 41
The LED indicator of the unit
26 displays ER42 and the wired
controller displays 42
52
Error code
Low pressure of #2

Superheat of #2 is too low

Refrigerant leakage in #1

Refrigerant leakage in #2
TH1 temperature sensor
malfunction
TH2 temperature sensor
malfunction
TH3 temperature sensor
malfunction
Symptom Possible cause
1. Malfunction of heat
exchanger
2. Malfunction of the fan
3. Insufficient refrigerant or
leakage
4. Failure of low pressure
modular input port
5. The low pressure sensor
has broken down
1. The low pressure sensor
or temperature sensor has
broken down
2. EXV control unreasonable Update model program
1. Low pressure sensor
failure
2. Insufficient refrigerant
1. Low pressure sensor
failure
2. 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
Solution
Check and troubleshoot
Check and troubleshoot
Check and replenish
refrigerant
Replace the module
Replace the pressure sensor
Replace
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