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Mend Heating Hot Water Timer

boiler firing up with clock off?

When the timer for hot water and heating goes off the boiler still continues to fire up

sandy
February 2010
Heating, Home Heating SystemsHeating Hot Water Timer
Would help to know boiler type if it has two zone valves faulty micro switch or swithes on clock fused together

a
February 2010
No, boiler doesn't have this frost protection facility. It is 8 years old and this hasn't happened before.
Thanks for answering though. Any more suggestions?

sandy
February 2010
In cold snaps, the boiler may continue to fire up, even if not set to do so, to maintain heat in the radiators pipes, preventing them from freezing as a safety feature depending on your boiler type (frost state protection) Check your user manual for frost protection.

YAN
February 2010

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Boiler Keeps Firing Up - Timer Off?