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I do not think there is a problem with the flexible hoses. The temperature difference GT8/GT9 is what it should be and the compressor temperature is also normal. If there is a problem with the flow to the condenser the temperature values should indicate that. My theory is that the wrong type of circulation pump also damaged something else in the control box. Try to check whether the high pressure switch is really triggered when this is indicated. The voltage drop over the high pressure switch should change.
Its the start delay, always there when the compressor is stopped by any reason, or if you turn of power to the machine.It is to protect the compressor from starting agains high pressure.The start delay gives the pressure time to equalize over the condensor/kompressor and/or valves.
The most easy thing to do, that costs nothing, is to measure the high pressure sensor, i would start with that.If the compressors stops within 3 minutes, you should be able to see if the pressure sensor really is changing over to alarm mode.Just stare at the multimeter. If the pressure really gets high, at "low" temp, it should be a faulty high pressure sensor.If the pressure gets high due to a faulty expansion valve the temp should also get high (I think)If the pressure gets high due to low flow, the temp should also get high.If you had a gas leak, the temp should get high, but the pressure would not get high. (Low pressure alarm at suction side)I still think you need to check the pressure sensor, and try to make sure you have got flow, if the flow is nearly zero, its impossible to depend on the temperature sensors readings, they might not "have time" to heat up before the high pressure alarm stops the compressor.It can of course be a faulty PCB, or it might be enough to replace the capacitors, but usually a bad capacitor is "swollen" on top. Changing PCB and/or houses is the most expensive, i would save that to last.