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Viessmann AR145 ( year 1989 )

HI,



My boiler doesn't start when the thermostat send a demand of heat. Yesterday, i had the same problem and the boiler lighted up when i reconnect the wire from the thermostat (red wire). I tried the same thing today with no success. My thermostat is a White-Rodgers model 1F80-261 ( 80 Series Comfort-Set ). Please i need a pist of solution.

Could you help me.



Thank you
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