Daikin furnace cycles on and off frequently (short cycling), with room temperature never reaching the thermostat setpoint.

Safety: Repeated short cycling can damage components. Address airflow and control issues promptly.

Steps to check:

• Filter and registers: Replace the filter and open all registers and returns.
• Thermostat location: Ensure the thermostat is not located above a supply register, near a heat source, or in direct sunlight.
• Observe cycle: Time how long the furnace runs before shutting off. If it stops after only a few minutes and the blower continues briefly, the high limit may be tripping.
• Professional evaluation: A technician should measure temperature rise, static pressure, and compare furnace capacity to the home’s load.