Haier AU052FPERA - [43] Discharging temp. sensor Td too low protection; [46] Communication with inverter module failure

53
[43] Discharging temp. sensor Td too low protection
[46] Communication with inverter module failure
If the sensor characteristic
is correct
Replace the sensor
Reconnect
Replace of adjustment the
indoor unit EEV
Recharge refrigerant
If the terminal of
sensor is xed well
Check if refrigerant
is too much
In cooling mode, when the
indoor unit off if the EEV can't
completely close
No
No
No
Yes
Yes
Yes
Yes
Re-connect
Replace module
Replace wire
Replace connecting board
In cooling mode, when the
indoor unit off if the EEV
can't completely close
Measure if voltage of
CN28 on connecting board
changes by multimeter
Check if communication wire
between connecting board and
module is connected normally
No
No
No
Yes
Yes
Yes