Baxi Incorrect Underfloor Heating Configuration

Thermostat fails to control underfloor heating correctly; floor gets too hot or too cold.

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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

Wrong control mode (radiator vs UFH), Missing or faulty floor sensor, Incorrect maximum floor temperature setting, Miswired UFH manifold actuators

How to Fix / Troubleshooting

Safety first: Underfloor heating manifolds and actuators may involve mains voltage; isolate power before opening any wiring boxes.

Steps to correct:

  • 1. Check system type setting: In the installer menu, ensure the thermostat is set to underfloor heating mode if required, with appropriate cycle times.
  • 2. Verify floor sensor: If a Baxi floor sensor is installed, confirm it is enabled in settings and correctly wired. Test its resistance with a multimeter.
  • 3. Adjust limits: Set appropriate maximum floor temperature and comfort limits according to floor covering manufacturer recommendations.
  • 4. Inspect manifold actuators: Ensure each UFH loop actuator is wired to the correct zone output on the Baxi controller and that actuators open/close when commanded.

When to call a professional: Complex UFH systems should be commissioned by a heating engineer to ensure safe and efficient operation.

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Repair Difficulty

Hard 4/5

Required Part

Baxi underfloor heating zone controller
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