42
S/N Error Code Symptom Possible Cause Solution
12
The LED indicator
of the unit displays
ER27 and the
wired controller
displays 27
EWT,LWT
temperature
abnormal of
evaporator
TH6 and TH7 are inserted reversely or fall off.
Check whether TH6 and TH7 are inserted
reversely/fall off.
Detection circuit problem of control module
temperature sensor.
Replace the control module.
13
The LED indicator
of the unit displays
ER28 and the
wired controller
displays 28
High pressure
of #3
1. Heat exchanger dirty. Check and troubleshoot.
2. Blocked of refrigerant lter. Check and replace.
3. Water temperature too high (condenser). Tune down the water temperature.
4. Lack of water (condenser). Check and troubleshoot.
5. Blocked of water lter (condenser). Clean the water lter.
6. Too much refrigerant. Release a proper amount of refrigerant.
7. Failure of high-voltage modular output port. Replace the module.
8. The switch has broken down. Replace the pressure switch.
14
The LED indicator
of the unit displays
ER29 and the
wired controller
displays 29
Superheat of #1
is too low
The low pressure sensor or temperature
sensor has broken down.
Replace
EXV broken down. Replace EXV.
15
The LED indicator
of the unit displays
ER31 and the
wired controller
displays 31
Communication
failure with
master unit
Communication line of the slave unit has
loosen.
Check and troubleshoot the communication lines.
Incorrect DIP address setting for the slave unit.
Reset the addresses of all slave units and check
that there is no duplicate address.
The number of slave unit is set incorrectly for
the master unit.
Reset the number of slave units and check that
the number match with all the addresses.
The PC communication port of the slave unit
has broken down.
1. Exchange positions of the two 485 on the
slave unit.
2. Replace the control panel of the unit.
Communication line of the slave unit connects
wrong port.
Connect the communication line of the slave unit
to the Apc/Bpc port.
16
The LED indicator
of the unit displays
ER32 and the
wired controller
displays 32
Suction
temperature #1
is too high
TH9 temperature sensor loosen or connects
wrong port.
Check control model, connect temperature senser
properly.
TH9 temperature sensor short circuit or open
circuit .
Check resistance of TH9/ replace.
The temperature of discharge air is too high
and has triggered the racing protector of the
compressor.
see Item 17 in the table.
17
The LED indicator
of the unit displays
ER33 and the
wired controller
displays 33
Discharge
temperature #1
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).
Insufcient refrigerant or leakage. Replenish a proper amount of refrigerant.
TH1 temperature sensor is broken down. see Item 24 in the table.
18
The LED indicator
of the unit displays
ER34 and the
wired controller
displays 34
Suction
temperature #2
is too high
TH10 temperature sensor loosen or connects
wrong port.
Check control model, connect temperature senser
properly.
TH10 temperature sensor short circuit or open
circuit .
Check resistance of TH9/ replace.
The temperature of discharge air is too high
and has triggered the racing protector of the
compressor.
see Item 19 in the table.
19
The LED indicator
of the unit displays
ER35 and the
wired controller
displays 35
Discharge
temperature #2
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).
Insufcient refrigerant or leakage. Replenish a proper amount of refrigerant.
TH2 temperature sensor is broken down. see Item 25 in the table.
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