My heat pump is knackered! Apparently there was an epidemic fault about a year ago whereby a four way valve associated with the compressor would leak and eventually stop the refrigeration unit (that cools Hertfordshire) running. And so it was.
It will be passed to Mitsubishi who have accepted a warranty claim. I am to be advised what will happen and when, which could well be a new unit, or possibly a replacement of the peccant parts.
I'm happy in a way because, whilst it has been working, I have had reservations about the efficiency which was not hitting the claimed numbers. I had raised this previously and had a wishy washy response. With hindsight we can now surmise that is was limping along until it conked out due to lack of refrigerant and it will get sorted.
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Heating failed. And new gadget. 
Heating failed. And new gadget. 
