- 15 -
mend it if yes.
2. Check if PCB or display is
damaged. Change the
corresponding part if yes.
communication failure of frequency
conversion module(alarm when
communication between display and
PCB are disconnected)
excessive exhaust temp protection
1. Replace the compressor
discharge temperature sensor.
2. Reconnect or clean compressor
discharge temperature sensor and
wrap it with insulation tape.
Replace the controller or PC Board.
Water inlet temperature failure
Check or change the sensor
external coil temperature failure
Check or change the sensor
exhaust temperature failure
Check or change the sensor
1. Check if DC fan motor is
damaged. Change it if damaged.
2. Check if DC fan motor output
port on PCB has output. Change
PCB if no output.
Abnormal protection of frequency
conversion module
Solve it according to the subsidiary
error codes in the following table.
ambient temperature failure
Check or change the sensor
too low cooling outlet water temp
protection
Check whether the water flow or
water system is jammed or not
water outlet temperature failure
Check or change the sensor
Return gas temperature failure
Check or change the sensor
Too high heating outlet water
temperature protection
Check whether the water flow or
water system is jammed or not
Compressor current protection
1. Check if the incoming voltage
supply is too low, if so, repair.
2. Check if the compressor is
overloaded and repair.
3. Check whether the thermal relay
is damaged, if so, replace.
internal coil temperature failure
Check or change the sensor
◎
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 are display in priority.
When error codes 1-128 don’t appear, then error codes 257-384 can show.
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, display 48.
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