Air Source Heat Pump Mark 2

Our heating and hot water system had worked very satisfactorily since its installation in early February, first being used to dry out the house as it was being plastered, then, from the beginning of June, for general duties as we moved in. It has operated very economically, too, not least because it often benefits from the electricity generated by our PV panels.

Early last month, however, we noticed an error message on the controller which turned out to be terminal. Our installer contacted Mitsubishi who eventually admitted that they had had a bad batch of our model which had suffered from a 'harmonic' problem - any musical readers may be able to make sense of what was apparently a vibration issue leading to the failure of a valve. At first the suggestion was that a Mitsubishi engineer would come out to fix the fault, but within a couple of days this changed to an offer to provide a new pump unit which would need to be fitted by our installer. With one day to go before the arrival of friends to stay, this arrangement actually worked, with the new unit delivered from Derby and the new software SD card arriving 2 hours later by first class post. We have our fingers crossed that this replacement unit will have a long life.

For the record, here's the new one ..... 

..... and here's the old one on a pallet, waiting to be collected.

As a postscript, I should record a conversation with our optimistic builder, who, when told the system was down, said it should be easy to fix as 'there's not much in those pumps to go wrong.' See below for what's in the pump in the way of electronics and other bits and bobs.





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