Ruud air conditioner short cycles; outdoor unit turns on and off every few minutes without reaching set temperature.

Safety first: Turn off power before accessing thermostat wiring or control boards.

• Step 1 – Check thermostat location: Ensure thermostat is not in direct sunlight, near supply vents, or near heat-generating appliances. Relocation may be necessary.
• Step 2 – Verify thermostat settings: Disable any extreme cycle rate or compressor protection settings that may cause rapid cycling. Consult thermostat manual.
• Step 3 – Filter and coil check: Replace dirty filters and clean coils to prevent pressure switch trips that can cause short cycling.
• Step 4 – Observe pressure switch behavior: If the unit stops abruptly and restarts after a delay, a safety switch may be tripping. A technician should check refrigerant pressures and switch operation.
• Step 5 – Professional evaluation: If the system is oversized or ductwork is inadequate, a load calculation and possible equipment/duct modifications may be required.