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Hi, Thanks for quick reply! Found model no. 24s! Have adjusted control knobs to "2o'clock" As with regards to the 'blocked secondary heat exchanger' I found the following post below, however, seems a bit complicated to me so is there an easier way to deal with it or should I simply call...

We have a Biasi Riva Compact M90E model (not sure if 24s, 28s or 32s?). Recently the water has started to go from hot to cold when having showers as well as when turning on the taps and also one of the radiators seem to be switching itself on and off while all the others are working fine...