Danfoss Ally Valve Not Closing / Constant Heating

Radiator controlled by Danfoss Ally thermostat is always hot, even when the thermostat is set to a low temperature or off.

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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

Valve pin stuck in open position, Ally thermostat not seated correctly on valve, Internal motor not driving to closed position, Incompatible valve with too long stroke

How to Fix / Troubleshooting

Safety first: Radiators and pipes may be very hot. Use gloves if necessary.

Steps:

  • Set low temperature: Set the thermostat to a low setpoint (e.g. 5°C) and wait for the motor to drive the valve closed.
  • Check mounting: Ensure the Ally head is firmly attached and not rotating freely. Tighten the clamp or ring nut.
  • Remove and test valve pin: Remove the thermostat and verify that the valve pin can be pressed in and springs back. If it does not move or stays in, the valve body is faulty and must be replaced.
  • Recalibrate: Reinstall the thermostat and run calibration. If the radiator still heats constantly, the internal drive may be defective and the Ally head should be replaced.
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Repair Difficulty

Medium 3/5

Required Part

Danfoss Ally Radiator Thermostat or Radiator Valve Body
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