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Ok... so a bit more fault finding. The water tank thermostat does cause the valve to close when it reaches the desired temperature which is a relief because it means that the water isn’t going to boil dry. It also means that the port valve must be working fine. Now I need to spend a bit of...

Thanks. There is a thermostat on the hot water tank and I meant to check whether that will limit the heating input to the water. I feared that the culprit might be the mass of wires shoved into a junction box (not by me, I hasten to add!)

Thanks for the quick reply. The sticky-out bit is staying in the open position and only goes back to rest when the power goes off for the CH. I can hear it close and the switch is loose until the CH powers down. If I set just the HW (without the CH) to go on and then turn it off at the...

Hi I’ve got many fingers crossed in the hope that some of you good people can help me... It’s an ‘S’ system traditional gas boiler with a hot water tank and radiators, with two 2-port valves to separate the HW and CH parts of the system. I can use the programmer no problem to fire up either or...