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Viessmann Dekamatik hk1

I have a Dekamatik hk1 controller that controls a 4 way valve for my radiant heat in a concrete slab in my kitchen. The power light is lit but the readout panel is blank. The system is not working. Pump is not running. Any help would be appreciated.
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Comments

  • Paul PolletsPaul Pollets Posts: 2,840Member ✭✭✭
    Age?

    How old is the unit? The screens will go blank when aged and there's no fix. Replace the Comfortrol programming unit. If your unit is under 2 years old, it's still warranted.
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