DIY Doctor

Mitsubishi Heavy A/C Split Issue

Postby Tonza79 » Wed Sep 12, 2018 8:51 pm

Hi, I’m normally an install engineer but today I’ve tried to run a newly installed mitsi split system but having the following issues. I’m trying to run it in cooling but it’s not really doing owt. Suction pressure drops to around 3 bar & suction valve frosts up, pressure then goes up to about 5 bar & condenser fan then cuts out for a few minutes. The frost evaporates off the suction valve & then the same process starts again. Put it into heating, indoor unit more or less shuts down just a slow fan speed. Outdoor unit kicks in after a few minutes then ramps right up but the suction pressure was 55bar and the valve was too hot to touch. The indoor unit just stays in low fan speed & no heat gets released. What could cause this? Sorry for being long winded
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