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Mend Isar HE24 Heating Boiler Timer

My Isar HE24 keeps switching itself on without the time!?

My boiler keeps coming on randomly without the timer, the display shows a 't' then stays on for a few minutes (according to the manual this is a normal boiler function to pre heat the supply before its needed) however it keeps doing it to the point where the heating is constantly on when left switched on (with or without timer) any ideas?

Sharon Ridding
February 2012
IsarIsar HE24Heating, Home Heating SystemsHeating Boiler Timer

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