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Abnormal Protection of Frequency
Er 20
Conversion Module
Er 21
Ambient Temp. Fault
Low Outlet Water Temp Protection
Er 23
Er 27
Water Outlet Temp. Fault
Er 28
CT Over Current Protection
Er 29
Suction Temp. Fault
High Outlet Water Temp. Protection
Er 32
Er 33
Outdoor Coil High Temp. Protection
Er 42
Internal Coil Temp. Fault
E20 fault will display the following error codes at the same time, the error codes will
switch every 3 seconds. Among them, error codes 1-128 appear in priority. When
error codes 1-128 don't appear, then it will show error codes 257-384. If two or more
error codes appear at the same time, then display error codes accumulation. For
example, 16 and 32 occur at the same time, it will show 48.
Code
Parameters Meaning
Compressor
1
over-current
2
Compressor out of step
8
Compressor phase loss
16
Low DC voltage
32
High DC voltage
12 September 2023/ DH
when Cooling
when Heating
1. The compressor is temporarily overloaded (for example, liquid
compression)
2. The program does not match the compressor
3. The U, V, and W lines of the compressor are inversely connected, and
the compressor reverses
4. Compressor wear (lack of oil, liquid compression lead to wear cylinder
block)
1. The compressor is temporarily overloaded (for example, liquid
compression)
2. The program does not match the compressor
3. The compressor start pressure difference is too high and low.
1. Cables U, V, and W of the compressor are missed or improperly
connected
2. The program does not match the compressor
3. The compressor starts too high and low pressure difference
1. Check whether the AC voltage is abnormal
2. AC power is suddenly cut off, and the DC voltage will be too low when
the converter capacitor is left for the chip to work
Check whether the AC voltage is abnormal
Solve it according to the subsidiary error codes in the
following table.
Check the connection, change the sensor if necessary.
Check the water flow and water system,mend it if
necessary.
Check the connection, change the sensor if necessary.
Check the connection, change the sensor if necessary.
Check the water flow and water system,mend it if
necessary
Wait for the ambient Temp. drops and restart the unit.
Fault Solution
[Hier eingeben]
Seite 12 von 26
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