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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.
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.
This error message is because the water tank is full. Just empty it out
and put it back in and the AC will start to work again. If that doesn't
work then I don't know what the problem is, but I just had the E4 error
and did that and the problem was solved.