Viessmann VS 74 - User Manual

Questions and Answers

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scottethanAug 10, 2025
How to fix Viessmann VS 74 not producing soft water?
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  charlestorresAug 10, 2025
  If your Viessmann Water Dispenser isn't producing soft water, it could be due to several reasons. First, check if the salt storage tank is empty and add salt if needed. Also, the salt might have formed a 'bridge'; if so, break it up. Ensure the power supply is properly connected and the outlet is functioning. The bypass valve(s) should be in the service position. The nozzle and venturi assembly might be dirty, plugged, or damaged, requiring cleaning and inspection. Finally, inspect the drain hose for any kinks, bends, or obstructions.
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Raymond BauerAug 15, 2025
Why is Viessmann VS 74 Water Dispenser water hard sometimes?
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  cdunnAug 16, 2025
  If the water from your Viessmann Water Dispenser is sometimes hard, there might be a few reasons. It could be due to hard water being bypassed during recharge because the current time or recharge time settings are incorrect, so check and correct these settings. Also, the hardness number setting might be too low, so check the current hardness setting and increase it if needed. Avoid using hot water during recharges, as the water heater refills with hard water. An increase in the actual hardness of the water supply might also be the reason, so test an unsoftened water sample and adjust the hardness setting accordingly. Finally, the turbine might not be turning freely, so check the turbine.
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Jesse MorganAug 21, 2025
What to do if Viessmann VS 74 motor stalled or clicking?
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  Kathryn SmithAug 21, 2025
  If your Viessmann Water Dispenser motor is stalled or clicking, it indicates a motor malfunction or an internal valve fault creating high torque on the motor. In this case, you should contact a service technician.
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Elizabeth WebsterAug 28, 2025
What does error code E1, E3 or E4 on Viessmann VS 74 mean?
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  Ian MannAug 28, 2025
  If your Viessmann Water Dispenser displays error code E1, E3, or E4, it suggests a fault in the wiring harness, connections to the position switch, switch, valve, or motor. It is recommended to contact a service technician.
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frostcindySep 2, 2025
What does error code E5 on Viessmann VS 74 mean?
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  josephsolisSep 2, 2025
  If your Viessmann Water Dispenser displays error code E5, it indicates an electronic control malfunction. In this situation, you should contact a service technician.