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managed to get underfloor heating manufacturer to send their (very knowledgeable) engineer to have a look. He has confirmed no fault with undefloor heating. the blending station has probes that sit within the water flow; we ran the system for maybe half an hour with the boiler CH output wound...

thanks for all the replies. Ravenheat stripped out a heat exchanger which im guessing was the DHW - it was a rectangular metal box with sort of corrugated sides. the engineer flushed it out but it had no debris in. I think i might get my gas-safe chap to flush the boiler, treat it and then ive...

many thanks for the reply. weve had the boiler output set at pretty much every possible output temp but to no avail. the pump is running ok on the underfloor blending unit, i cant vouch for the one in the boiler but im assuming it must have been checked as ravenheat have had the boiler in bits...

Im posting this in the hope of help/inspiration and to vent some steam (no pun intended!) I have a Raveheat CSI 150 fitted about 4 years ago by my gas safe chap. It feeds the domestic hot water and an underfloor heating system on 2 floors. I had some initial boiler problems but follwoing these...