Furnace is short cycling, turning on and off frequently without reaching set temperature

Safety: Normal short cycling is not immediately dangerous but reduces efficiency and wear.

Steps:

• Thermostat location: Ensure the thermostat is not near heat sources, drafts, or direct sunlight. Relocate if necessary.
• Adjust control settings: On Buderus Logamatic controls, adjust the heating curve and differential to reduce rapid cycling.
• Check flow: Verify all zones are open and radiators are not shut off, which can cause quick temperature rise at the furnace.

If cycling remains excessive, a technician should evaluate system design and control programming.