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please see the piping around the boiler and the hot water tank here //www.diynot.com/network/jz008/albums/18980 look forward to hearing any advice thank you

sorry picture here: //www.diynot.com/network/jz008/albums/

thanks you. its a 28mm shown in picture below; just also emailed PTS for advice

thank you Ian sorry my typo. the brand is Boss Therm not Boss Term thought the problem was that a "firing" signal is somehow being sent to the boiler constantly and central heating is up all day and night (house gets too hot), so the valve must have been open all the time?

thanks Mick it has indeed stopped the boiler constantly switch on and off. Thank you! While i wait to get the valve fixed/replaced, if i set the valve at manual open and leave grey wire disconnected, would the CH & HW still function as normal? I have room thermostat and programmer for CH...

thank you Mick i can do basic test. what should i look out for?

Potterton Boiler Model: Profile 100e moved int to the "new" house two months ago. the boiler is probably near 10 yrs old It turns itself on and off every few minutes constantly all day long even when CH&HW thermostat are OFF. House gets too hot during night for comfort. So does the...