Dicharge Superheat Of #1 Is Too Low; Dicharge Superheat Of #2 Is Too Low; Low Pressure Of #1 - Daikin UHA075B5 Catalogue/Engineering Data

S/N
The LED indicator of the unit
7 displays ER20 and the wired
controller displays 20
The LED indicator of the unit
8 displays ER21 and the wired
controller displays 21
The LED indicator of the unit
9 displays ER22 and the wired
controller displays 22
The LED indicator of the unit
10 displays ER23 and the wired
controller displays 23
The LED indicator of the unit
11 displays ER24 and the wired
controller displays 24
The LED indicator of the unit
12 displays ER26 and the wired
controller displays 26
The LED indicator of the unit
13 displays ER27 and the wired
controller displays 27
The LED indicator of the unit
14 displays ER29 and the wired
controller displays 29
50
Error code
High pressure of #1

Low pressure of #1

Dicharge superheat of #1 is
too low
Dicharge superheat of #2 is
too low
High pressure of #2
Overload of water system
heater
Ambient temperature too
high/low
Superheat of #1 is too low
Symptom Possible cause
1. Heat exchanger dirty
2. Blocked of refrigerant filter Check and replace.
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
8. The switch has broken
down
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. The low pressure sensor
or temperature sensor has
broken down
2. EXV control unreasonable Update model program
1. Heat exchanger dirty
2. Blocked of refrigerant filter Check and replace.
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
8. The switch has broken
down
1. Check if there is heater
2. Heater short circuit
1. Ambient temperature
sensor broken down
2. Ambient temperature too
high/ low
1. The low pressure sensor
or temperature sensor has
broken down
2. EXV control unreasonable Update model program
Solution
Check and troubleshoot
Tune down the water
temperature
Check and troubleshoot
Clean the water filter.
Release a proper amount of
refrigerant
Replace the module.
Replace the pressure switch.
Check and troubleshoot
Check and troubleshoot
Check and replenish
refrigerant
Replace the module
Replace the pressure sensor
Replace
Replace
Check and troubleshoot
Tune down the water
temperature
Check and troubleshoot
Clean the water filter.
Release a proper amount of
refrigerant
Replace the module.
Replace the pressure switch.
If no, short connect overload
switch
Replace the heater
Replace the sensor
Stop the unit
Replace