Worcester Bosch Relay chatter or electrical noise

Thermostat makes clicking or buzzing noises frequently.

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

Rapid cycling due to tight temperature differential, Faulty relay coil, Electrical interference on control lines, Incorrect minimum run‑time settings

Safety first: If any burning smell is present, switch off power and call a professional.

Adjust cycle rate: In installer settings, increase the temperature differential or minimum on/off time to reduce rapid cycling.
Check mounting: Ensure the thermostat is firmly mounted; loose casings can amplify normal relay clicks.
If buzzing persists: The relay may be failing. Replacement of the thermostat or receiver is recommended.

Medium 3/5

Worcester Bosch RF Receiver Module

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