Potterton M11F Boiler

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6 Dec 2004
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United Kingdom
The boiler has suddenly stopped heating the radiators but is still heating the hot water.

I found a DIY site and carried out the following:- Checking the header tank first in the loft I found that a family of mice that I had recently heard and poisoned had drowned. I emptied the tank, cleaned it and refilled with water. Thinking that a dead mouse may have entered the outlet pipe and blocked it I then emptied all radiators, refilled and bled them. So I knew that all rads and the headed tank were full.

I disconnected the power and gas to the boiler, removed the front cover and cleaned it inside thourougly but could see nothing obviously wrong. I then repaced the cover and turned the boiler thermostat to off. switched the power on, reset the timer and set it to Auto / 24hrs. I then turned the boiler thermostat on and it fired up. After a short time I switched the hot water off in hope that the central heating would remain on but the boiler shut down. I swithced the hot water back to auto and the boiler fired up again.

I have another single thermostat that I am about to disconnect for a trial but I do not feel that this will change anything. My installation manual says that all the parts that have a shelf life are easy to replace but I do not know what.

Would like to hear from anyone who can help as I hate being ripped of by so called experts.

Full of Hope
 
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It sounds like it works OK for HW, so check the operation of the Y-plan valve, could be stuck or duff micro-switch.
 

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