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12Feb/120

Viessmann 100 Failure


Viessmann 100 combi boiler was failing to go over to CH (heating) even though the room thermostat was calling for heat! Hot water was okay but heating failed until the honeywell controller was turned off then turned on again. Once reset, the Ch worked without fail. The cause of the problem was not the batteries in the controller, but the controller itself! Once replaced this programmer didn't pose a problem. all good and the customer advised.

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