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Mend Heating Set Timed

Heating stays on but timer off?

Heating stays on continuous even though timer has gone off, this happens if it is set to once a day or timed intervals. Anyone got any suggestions, is it just the timer that needs replacing or could it be more to do with valves?

Till
January 2010
Heating, Home Heating SystemsHeating Set Timed

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Heating Stays On - Timer Issue?