Heatit Relay Operation Noise or Electrical Buzz

Thermostat makes audible clicking or buzzing noises during operation

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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

Mechanical relay switching under load, Loose terminal causing arcing, High inrush current from load, Failing relay coil

How to Fix / Troubleshooting

Safety first: Turn OFF power at the breaker before inspecting wiring. Buzzing or arcing can be hazardous.

Steps to troubleshoot:

  • 1. Identify noise type:
    • Occasional single clicks are normal for relay-based models.
    • Continuous buzzing or rapid clicking is abnormal.
  • 2. Inspect terminals:
    • Check for loose screws or signs of arcing at L, N, and load terminals.
    • Tighten all connections.
  • 3. Check load type:
    • Ensure the load is resistive (heating cable, panel heater). Inductive loads (motors, transformers) can cause noise and should be switched via a separate contactor.
  • 4. Replace thermostat if relay is failing:
    • If buzzing persists, the internal relay may be defective; replace the thermostat.
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Repair Difficulty

Medium 3/5

Required Part

Heatit Thermostat Relay
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