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Mend Boiler Central Heating Temperature

My heating comes on by itself?

I have a combi boiler but I am noticing that the central heating keeps coming eventhough we have not set the timer on it to come on. The timer control shows it as been off, Why does the heating come on?

SB
May 2009
Heating, Convector HeatersBoiler Central Heating Temperature
run the hot tap for 5 min, see if it comes on (which it will) faulty diverter valve

p
July 2009

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Heating Coming On Itself - Combi Boiler