LED on Air conditoner showing E4. Also ice on outside unit, even though outside temp. in the 80sF (I am in Bermuda). No codes given in instruction manual - those found on web written in non-English !

E4 Error Code
The E4 display is not actually an error code, but indicates that the air conditioner has entered defrost mode. This occurs when the unit detects ice on the evaporator which located behind the front grille. Once defrosted, the air conditioner will resume normal operation.
https://www.lg.com/us/support/help-library/error-codes-room-air-conditioner-CT10000014-1432829295501

https://sialkotacrepairing.com/2020/01/20/orient-ac-error-codes/

lack of freon chrage. consult nearest center.

PDF]SERVICE Manual - Quietside

https://www.quietside.com/archives/.../Service%20ACC1800C.pdf

When error occurs in air conditioner, error code is displayed on indoor unit .... Display priority order at overlapping error : E1?E4?E5?P0?P0?P5?P6?t1? ...

Midea air conditioner error codes

airmaster.net/midea-air-conditioner-error-codes/

Midea air conditioner error codes. Indoor unit error code explanation: R series: ... E1, Indoor / outdoor units communication protection. E2, Zero-crossing signal error ... E4, Outdoor unit temp. sensor or connector of temp. sensor is defective.

[PDF]Download the Fault Error Code Booklet - Samsung

Hi,
E4: Indicates lack of refrigerant, or the compressor is not running, or the thermistor is out of
calibration.
Action: Check that the compressor is running by listening.
If it is apparent that the compressor is running, then check the
temperature difference across the evaporator.
i.e. Measure temperature of return air at inlet filters and
measure temp. of discharge air at grilles. This temp diff.
should be 14 to 18 C. with fan on hi speed. If temp diff. is less than this,
suspect lack of refrigerant.
Fit a suction gauge to access valve at rear of unit. See fig 12. On a 35C
outside temp. then suction should be 380 to 450Kpa.

Good luck

Here are the SoleusAir error codes...
e2 Room temperature outside of working range of unit (too cold).
e3 Faulty coils - Repairs needed.
e4 Internal frost in the unit - Defrost.
e5 General failure - repair needed.
e7 Reservoir full - Empty the reservoir.
If the unit is freezing up (frosting) you may want to check (clean / replace) the filters.

try unplugging it from the wall for 15 seconds and then plug it back in.this normally works for me.if it doesn't work then let me knoe

E4 Outdoor activation of low pressure switch/ less suction pressure.

Check back pressure, which should be 60 PSI when ambient temp 98 degree.If not Short of gas- find leak and arrest. And do gas charging. Even due to indoor coil dust blocked also e4 arise. Clean the coil and reset it.

The E-4 message indicates low on refrigerant (R-410A type) You will need guage hose adapters sold by Ritchie/Yellow Jacket # 19173
Pridiom Group 201-266-8234 option2
[email protected]

There is a water holding tank on the right lower side (when u are looking at the front), empty it and the unit comes back on.

E4 indicates your unit is in need of service.