Thermostat makes clicking noises frequently, even with small temperature changes

Safety first: No high-voltage work is required; adjustments are made at the thermostat.

Steps to troubleshoot:

• 1. Adjust cycle rate: In advanced settings, reduce the cycles per hour (CPH) for heating and cooling to minimize relay activity.
• 2. Increase temperature differential: If available, widen the temperature differential (swing) so the system does not cycle for very small changes.
• 3. Improve placement: Ensure the thermostat is not in a drafty area or directly in the path of supply air, which can cause rapid temperature fluctuations.
• 4. Monitor equipment: Confirm that the HVAC equipment is not short-cycling due to other issues (e.g., limit switches, low refrigerant).

When to call a professional: If clicking is accompanied by equipment short-cycling, an HVAC technician should inspect the system.