Hoval Room temperature control fault

Furnace runs continuously and overshoots room temperature

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.

Possible Causes

Faulty room thermostat or Hoval room sensor, Incorrect controller mode (manual override), Stuck relay on control board, Misplaced room sensor near heat source

How to Fix / Troubleshooting

Safety: Overheating wastes energy and can stress components.

Check controller mode: Ensure the Hoval controller is not in manual or party mode forcing continuous operation.
Inspect room sensor: Confirm the sensor is located in a representative room away from direct sunlight or radiators.
Test thermostat: Turn the room thermostat down and listen for a click; if the furnace continues to run, the thermostat or control relay may be faulty.
Temporary measure: Reduce the flow temperature setpoint to limit overheating until repairs are made.

Repair Difficulty

Medium 3/5

Required Part

Room Thermostat / Room Sensor

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