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Just to update - Today I isolated and flushed each radiator in turn several times until the water ran relatively clear. I then removed the heat exchanger. First I flushed with a strong hose and this removed quite a bit of black crusty stuff. I then soaked in descaler which seemed to loosen up...

Ah that makes sense. I now realise that the temperature reading is for the water in the primary circuit before it goes into the plate heat exchanger and not for the temperature of the hot water to the tap! Thank you very much for your help. I will drain the primary circuit tomorrow and remove...

Hi, I'm having problems with my Baxi Duo Tec Combi 28 HE A. I noticed it first in the shower that the water was going hot-cool-hot. Looking at the temperature gauge on the boiler it is reading incorrect. The temperature gauge is set at 60oC but even when the water is cold it's reading around...