Toshiba Short Cycling / Improper Capacity or Control

Unit frequently turns on and off (short cycling) without reaching set temperature.

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Possible Causes

Oversized Toshiba unit for room size, Blocked return air causing sensor misreading, Room sensor located in wrong position, Dirty filters and coil

How to Fix / Troubleshooting

Safety first: Turn off power before removing covers.

  • Step 1 – Clean filters and coil: Ensure unrestricted airflow through the indoor unit.
  • Step 2 – Check sensor location: Confirm the room temperature sensor is in the air intake and not touching the coil or exposed to direct sunlight.
  • Step 3 – Avoid obstructions: Do not block the front of the indoor unit with furniture or curtains.
  • Step 4 – Adjust setpoint and fan: Use a moderate set temperature and continuous fan mode to reduce cycling.
  • Step 5 – Capacity issue: If the unit is significantly oversized, short cycling may be unavoidable; consider consulting an HVAC professional.
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Repair Difficulty

Easy 2/5

Required Part

Room Temperature Sensor (Thermistor)
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