Fibaro Incompatible Control Mode / Actuator Noise

Thermostat causes audible clicking or buzzing from connected actuators

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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

PWM control used with thermal actuators not designed for rapid cycling, Loose actuator mounting, Low‑quality valve actuator on manifold, Incorrect voltage actuator connected

How to Fix / Troubleshooting

Safety first: Turn off power before touching actuators or wiring.

Steps to reduce actuator noise:

  • 1. Identify actuator type:
    • Check if the connected actuators are thermal (slow) or motorized (fast).
  • 2. Adjust control mode:
    • In the Fibaro thermostat settings, change from PWM to simple on/off control if thermal actuators are used.
  • 3. Check actuator voltage:
    • Ensure actuators are rated for the supply voltage provided by the thermostat or manifold (e.g., 230V or 24V).
  • 4. Tighten mounting:
    • Secure actuators firmly to the manifold to reduce vibration noise.
  • 5. Replace noisy actuators:
    • If noise persists, consider upgrading to higher‑quality or compatible actuators.

When to call a professional: A heating installer can verify actuator compatibility and adjust control strategies.

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Repair Difficulty

Medium 3/5

Required Part

Underfloor Heating Manifold Actuator
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