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I don't know about oil in the condenser unit, whatever that means, but I do know I have a Karcher with exactly the same symptoms. I won't be buying a Karcher again, their reputation seems to be a bit iffy.

Boxerfan...the points you are raising are exactly the ones I was thinking of raising myself, I'm looking at the Viessmann (Vitodens) compact, and need to choose between 18 and 24 kW. I'm inclined towards the lower rating, as there should be less of a tendency to short-cycle. Also, if there was...

You say the boiler is doing overtime, which I take to mean that it's burning all the time. So either it's just too small, or its efficiency is low. It would be useful to know the boiler rating, and the size/type of house. What is the actual temperature in the house, and what temperature is the...