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Thanks @ProDave  David Came out and ran a few tests on the unit.  Everything looked good at the start he resistance tested the compressor and fan motor and a few other components on the board and all look ok.  He then started the insulation test and put some voltage into the compressor,  he...

The spark only had a voltage meter to test so i have no idea of the amperage  The heat pump guy said we could use a 100mA RCD but spark wasn't happy to change anything.  He has just decided that the unit is faulty and wont touch anything else. 

I thought you were talking British Standard there for a minute. 

Thanks @ProDave I really appreciate all the help so far.   David from BiuldHub is hopefully calling out at some stage this evening to do some testing.   I also spoke to another Electrician locally about 1 hour ago who confirmed that yes the Heat Pump should be on its own Circuit with a Type C...

Thanks @binky This is what the Heat pump guy i spoke to said that the RCD can become somewhat sensitised to the earth leakage.   I spoke to my electrician about it and he said as i was a TT install there is no way he could wire up the heat pump with no RCD?  I'm not sure if thats correct as per...

Thanks guys,   So the main area of dispute between the people i have spoken to is  A) 130V ramping up to 230V of earth leakage is definately an appliance problem B)  DC inverters can run dirty and that level of earth leakage can be expected.  Option A points to a heat pump compressor fault...

Yes i have been advised that fitting an separate RCD (Type A) for the Heat pump.  The type A are supposed to be better suited to DC and avoid tripping.  Fan blades spin freely and very easily.  No Ice or signs of any water in or around the unit.  Thanks

Thanks binky So do you think a good option would also be to replace the isolator and retest?  Its very hard for me to know what is the best way forward as i dont really know what i'm doing.    I'll pick up a new isolator and check the fins.  But any time we had it running it was running well...

will try and spin the blades and let you know.  No ice and no signs of water anywhere around the PCBs.  The isolator had some water/condensation etc but we gave it a good dry out and a few minutes with a hair dryer. 

Thanks @ProDave  really appreciate the help so far! 

He tested it at the unit with the voltage meter.  He tested the isolator by removing all wires from the heat pump L/N/E and calling for heat and there was no trip.  Trip only occurs when the heat pump is wired in.   He felt satisfied that this cleared the cabling from the fuse board to the heat...

This really doesn't fill me with confidence.   So removing the earth isn't very clever then?  I was confused as to how he was testing the unit alright.   He was holding one probe to the live terminal and one to the earth terminal and getting the voltage reading.   I was thinking he would have...

Hi Guys,  I'm not a spark so forgive the very basic descriptions.  My Heat pump has been running happily for the last 12 months with no major issues (some wiring issues with startup and shut down signals) But a week ago it started to trip the 30mA RCD on the board (We have a split board with...