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Mitsubishi H.I. SCM 45 ZF-S, dual, outdoor unit problem

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Hello everyone.

The A/C doesn't heat. It starts ventilator and compressor. The pressure in heating is 12 bar (it doesn't move), current is 1,4 amps.
This is the current situation.

When I came and started the A/C it worked properly for about 15 min. The pressure was 30> bars, current 4-5 amps. And then presssure started to fall down.

There is no led signaling on the outdoor unit.
Signalisation on the indoor unit is:
RUN - 1 blink every 6 or 7 seconds,
TIMER - stays on

First I changed the whole PCB of outdoor unit, didn't make difference.
Then I changed EEVs, reactor, again nothing.

When I replaced the whole outdoor unit, it started working properly.

Is it compressor, and have can I check the compressor?

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