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thanks for replies guys, looks like I have another headache though - because radiators were not heating up too fast I decided to give them a flush - all done ok but then I realised that as I put the CH back on this afternoon the return flow rad pipe (not the thermostat side) was heating up...

thanks very much for the fast reply chris - it's sort of good news n bad news - good you have confimed what it is & bad for the overtime :? Could I ask do you think this could have been caused by the cold water pressure into the house being so high - should the installer 2 yrs ago have tested...

Hi, I have a Ferroli F30 combi sealed CH system (2 years old) and have spent many hours in the diynot forum & searching faqs for an answer to my problem which is: When the DHW is turned on my CH gauge slowly rises to 3+ bar (over 2 minutes) & the PRV operates (PRV does need replacing). I...