Midea MPPD-12CRN1-BI0 - Malfunction and Troubleshooting; Error Codes and Solutions

It’s invalid for compressor’s delay operation protection when unit is at
defrosting function mode.
On defrosting process, if malfunction occur, or power off, or change for
non-heating mode, unit will esc defrosting function mode.
At Heat pump mode, if P1 occurs, compressor, indoor/outdoor fan stop
immidiately. Four-way valve keeps open.
The ION/TIMER functions are valid at Heat pump mode.
4. MALFUNCTION
4.1 Error codes and Solution.
E1---Room temperature sensor error.
E2---Evaporator temperature sensor error.
E3---Condenser temperature sensor error.
Causation:
a) Port of temperature sensor is loose.
b) Temperature sensor is bad.
c) Circuit component is bad.
Solution:
a) Check the connection between temperature sensor and adaptor
is ok, if not, please make sure the port plugs into the adaptor hard.
b) Restart the unit. If it can not resume. Please use another good
temperature sensor instead.
c) Restart the unit. If it also can not resume. Please replace the PCB.

E4---Display panel communication error.
Causation:
Communication failure for 2 minutes consecutive between indoor and
outdoor.
a) Wire port is loose.
b) Circuit component of display panel is bad.