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Got a baxi back boiler about 20 years old works fine upto the other day when the heating is on the thermosate dos'ent seem to be working the boiler is just running on full all the time and not coming on and off as it should.

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Can you control heat with thermostat by turning it all the way down. I assume from your description that burner is running. If it is and turning t-stat all the way down made no difference I would remove t-stat from wall and remove red or white wires from it.This should cut power to gas valve turning burner off. If this works replace t-stat. Hope this helps. Thanks.

Posted on Nov 08, 2010

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