Immergas Noisy Relay or Power Supply

Thermostat emits a buzzing or clicking noise frequently during operation

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

Relay chattering due to unstable control signal, Loose relay on PCB, Poor power supply regulation, Incorrect cycle rate settings

Safety: Disconnect power before opening the thermostat.

Step 1 – Observe pattern: Note if the noise occurs when heating turns on/off or randomly.
Step 2 – Adjust cycle rate: Reduce the number of cycles per hour in advanced settings to minimize relay switching.
Step 3 – Tighten mounting: Ensure the thermostat is firmly mounted; vibration can amplify normal relay clicks.
Step 4 – Internal inspection: A technician can inspect the relay solder joints and power supply components. If chattering persists, replace the thermostat.

Medium 3/5

Immergas thermostat heating relay output

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