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Brian, Plumber
Category: UK Plumbing
Satisfied Customers: 836
Experience:  16 yrs. experience as plumber, including full bathroom and kitchen installations.
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Boiler will not switch off when required temperature is

Customer Question

Boiler will not switch off when required temperature is reached
Submitted: 1 year ago.
Category: UK Plumbing
Customer: replied 1 year ago.
the boiler appears to be working now. i will monitor and get back to you
Expert:  Andrew Smith replied 1 year ago.

2 stats?

Do you have motorised valves to control the zones?

Customer: replied 1 year ago.
to be honest with you i do not know
i have a worcester greenstar cdi combi boiler
i am not a plumber or anything like that so not sure
Customer: replied 1 year ago.
oh yeah two stats
one for down stairs one for up
i have changed the upstairs one as i used that the other day to switch on the heating and that is when the problem began so changed the stat for a new one but it still doesn't turn of upstairs unless i switch it off on the boiler
even on the programmer if that is on off it still heats up and sends the hot water to the rads up stairs
hot water works well - no problems there
Expert:  Andrew Smith replied 1 year ago.

If you have a split system then you will have motorised valves controlling each circuit.

If one gets stuck open internally then it can continue to fire the boiler even when off.

Check if any of the levers are slack when everything should be off

Customer: replied 1 year ago.
where do i look for that - is this something that i can solve or if your honest do i need a plumber?
Expert:  Brian replied 1 year ago.

Hi yes I would think that the zone valve for upstairs has jammed open, A plumber is required i am afraid to say.

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