Fibaro Reversed Logic / Output Configuration Error

Thermostat shows correct temperature but heating output is inverted (heats when it should be off, off when it should heat)

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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

Output mode set to normally closed instead of normally open, Incorrect parameter for heating vs cooling mode, Miswired relay contacts to actuator

How to Fix / Troubleshooting

Safety first: Turn off power before changing any wiring. Configuration changes can be done with power on.

Steps to correct inverted output:

  • 1. Check operating mode:
    • Ensure the thermostat is set to heating mode, not cooling, in the Fibaro settings.
  • 2. Review output parameters:
    • Some models allow selecting normally open (NO) or normally closed (NC) behavior.
    • Set the parameter appropriate for your actuator type.
  • 3. Verify wiring:
    • With power off, confirm that the actuator is wired to the correct output terminals as per the Fibaro wiring diagram.
  • 4. Test operation:
    • After changes, test by raising and lowering the setpoint and observing actuator behavior.

When to call a professional: If you are unsure about relay contact types or actuator requirements, consult a heating installer.

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Repair Difficulty

Medium 3/5
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