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Is a TRV the valve at the bottom of the radiators that adjusts the temperature? If so.then yes,they all have them. I don't know about the by pass but I will ask my son if he knows.Thanks for replying Reading the handbook it seems to be either the main pcb,the control PCB or the temperature...

We had always had a gas central heating system,but when we moved to a multi storey flat for health reasons,we decided to get an electric wet system installed,as the only heating in the flat was provided by 2 ancient storage heaters. That was 2 years ago,and we have been delighted with the...