Boiler runs but room temperature overshoots setpoint or fluctuates widely.

Safety first: Control adjustments are generally safe but avoid opening live electrical components.

Step-by-step checks:

• 1. Thermostat location: Ensure the room thermostat is not near heat sources, direct sunlight, or draughts.
• 2. Controller settings: Check Viadrus controller parameters such as hysteresis, night setback, and weather compensation. Adjust according to the manual for smoother operation.
• 3. Sensor check: If using a remote room sensor, ensure it is correctly wired and not covered or obstructed.
• 4. Flow temperature: Lower the boiler flow temperature setting to reduce overshoot and cycling, if compatible with your emitters.

When to stop: If comfort issues persist, a heating engineer can optimise control strategy and check for sensor faults.