Hive thermostat or receiver emits a buzzing or humming noise

Safety first: Buzzing components are inside mains-powered equipment. Isolate power at the fused spur before touching the receiver.

• Identify source: Listen closely to determine whether the noise comes from the thermostat (rare) or the receiver near the boiler (common).
• Check mounting: Ensure the receiver is firmly mounted to reduce resonance and vibration.
• Monitor operation: If buzzing only occurs when heating or hot water is on and there are no functional issues, it may be harmless but indicates wear.
• When to call a pro: Persistent loud buzzing, especially accompanied by heat or smell, suggests a failing relay or transformer and the receiver should be replaced.