Econ NE-F50SP/R4INV-PA, User Manual

Page: 31 / 54

28
Er 18 Exhaust temperature failure
Check the connection, change the sensor if
necessary
Er 19 DC fan motor failure
1. Check DC fan motor. Change it if damaged.
2. Check output port of DC fan motor on PCB.
Change the PCB if there is no output.
Er 20
Abnormal protection of frequency
conversion module
Solve it according to the subsidiary error codes
in the following table.
Er 21 Ambient temperature failure
Check the connection, change the sensor if
necessary
Er 22 DC fan 2 failure
Check the connection, change the sensor if
necessary
Er 23
Low outlet water temp protection when
cooling
Check the water flow and water system,mend it
if necessary
Er 27 Water outlet temperature failure
Check the connection, change the sensor if
necessary
Er 28 CT over current protection
Er 29 Suction temperature failure
Check the connection, change the sensor if
necessary
Er 32
High outlet water temperature protection
when heating
Check the water flow and water system,mend it
if necessary
Er 33 High temp. protection of external coil
Er 42 Internal coil temperature failure
Check the connection, change the sensor if
necessary
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.