Vaillant vSMART Poor Heat Distribution / Balancing

Some rooms are too hot while others remain cold, despite vSMART controlling the system.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Unbalanced radiators, stuck or incorrectly set TRVs, under‑sized radiators in cold rooms, thermostat located in an unrepresentative room

How to Fix / Troubleshooting

Steps to improve comfort balance:

  • Check TRVs: Ensure thermostatic radiator valves are open in cold rooms and not fully open in already warm rooms.
  • Balance radiators: Adjust lockshield valves to restrict flow to radiators that heat quickly and allow more flow to those that stay cold. This is best done by a heating engineer.
  • Thermostat location: Place the vSMART thermostat in a representative room (not the warmest or coldest) to avoid skewed control.
  • Consider zoning: For persistent imbalance, add additional vSMART zones or room controls to separate areas with different heating needs.

Balancing and zoning are mechanical/hydraulic tasks; vSMART can only control what the system can physically deliver.

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Repair Difficulty

Medium 3/5

Required Part

Thermostatic Radiator Valves
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