Heating won't turn off - Potterton Profile

decker · 2008-12-03T20:35:51+00:00

I have a strange issue with my central heating. Moved into a new house3 years ago and heating worked fine for a year, then last winter wehad an issue where it wouldn't turn off.We have a standard Gravity Fed System SetupPotterton Profile (in garage)Electronic Timer (in kitchen)Thermostat (in Hall)Zone Valve which switches between water and Heating (in airingcupboard by water tank).This is an intermittant problem and sometimes it doesn't happen forweeks then happens everyday for 4 or 5 days its very hit annd miss andunpredictable.So when the heating reaches the correct temperature or you turn thethermostat down the heating stays on, even if you turn the timer off(for the Heating and Water). It just keeps running and the house getshotter and hotter.We have to resort to flicking the main swich off so everything isshutdown which is annoying.I've had several things done to try and fix the problem but none hasworked:1. replaced the Frost Stat in the garage (also bought a thermometerthat shows high and low temperature to see if it goes below the 5degrees, and it doesn't).2. Plumber suggested changeing the Zone value, so we did and this madeno difference.I've had a plumber out and they don't know.I could obviously replace the Timer and thermostat but then i'd havechange every part of the system, except the boiler.Has anyone seen this issue before and have any suggestions to fix,other than just replacing the boiler?RegardsStuart

Dec 03, 2008 Last reply: 4 years ago 22 Replies

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Brian Gaff 8 years ago

With respect, I think they wanted to know the answer and all too often when somebody does find a solution, they just do not take the minutes needed to put it on the group, be it by a dodgy portal or not. Brian

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tabbypurr 8 years ago

yes, that was in Cullie's question

indeed. Keep up lad.

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Sev187 4 years ago

I have the same problem as was originally posted, however don’t know the valves involved in the system. The setup is the same as deckers and I have just started to experience the exact same problem with the heating being on, even with thermostat off or on low, controller switched off for CH and HW.

My basic understanding is, I have a potterman boiler in the garage, a water tank in the loft and a heater tank in the cupboard on 1st floor. I moved the property a year ago with no issues and haven’t needed CH for 6months and today when I turned it on, it wouldn’t turn off. After trying all the basic of hall thermostat, timer settings, boiler reset etc, I had to turn the boiler off at the mains in order to stop CH.

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