The boiler runs, but the room temperature overshoots the setpoint and becomes too hot.

Safety: Control adjustments are generally safe, but follow the manual.

• Check thermostat setting: Confirm the setpoint is correct and that any schedule is appropriate.
• Relocate sensor: If the Hoval room sensor is in a cold hallway or near a draught, move it to a representative living area.
• Adjust heating curve: Reduce the heating curve or maximum flow temperature on the Hoval controller to moderate room temperatures.
• Zone valves: Ensure motorised valves close properly when there is no demand. Replace faulty actuators.