Yes, this is exactly what my 6kW used to do (before I took it out!) Are you faliliar with ‘running information’ in the service menu? You would find that the compressor discharge superheat will be a healthy 20, 40 degrees etc, but at 01:00 it will have gone to zero. I thought this impossible, but modern compressors can cope with liquid entering the suction side https://www.youtube.com/watch?v=RXV-35gfQrk&t=22s
what is happening is evaporation is happening in the compressor instead of outside. Normally, your air-out from the unit might be 4 degrees colder than air-in, but at 01:15, I bet your air out of the unit will be less than 1 degree colder. I gave up trying to discuss with Mitsubishi since they never acknowledged it as a problem
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