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Mend Ideal Isar Boiler Display

Why does my ideal isar boiler use the 't' function every 6 mins?

Every 6 minutes my isar boiler uses the heatplate exchange function. It displays 't' on the display.

Elaine Page
November 2007
it should do that when its not heating the ch or dhw,
its to preheat the dhw heat exchanger.

barry
November 2007
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