Furnace frequently short-cycles, turning on and off every few minutes

Safety first: Ensure safe access around the furnace and radiators before adjustments.

• Lower flow temperature: Reduce the boiler flow temperature setting to lengthen run times and reduce cycling.
• Open radiators: Make sure enough radiators are open to absorb the furnace output. Avoid closing most radiators while the boiler is large.
• Check thermostat location: The room thermostat should not be near heat sources or in direct sunlight. Relocate if necessary.
• Adjust control parameters: In advanced Roca controls, adjust anti-cycling time or modulation settings as per the manual.

Warning: Persistent short cycling can reduce component life. If unsure about control adjustments, consult a technician.