Mitsubishi Electric
Short Cycling / Control Instability
Indoor unit frequently turns on and off (short cycling) without reaching set temperature
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Oversized unit for room, Thermistor sensing incorrect temperature (e.g., near heat source), Dirty filters or coils, Incorrect remote or controller settings
How to Fix / Troubleshooting
Safety first: Turn off power before moving sensors or opening covers.
Steps:
- Check sensor location: Ensure the room temperature thermistor is in the return air stream, not touching the coil or near a heat source.
- Clean filters and coils: Dirty components can cause rapid temperature swings at the sensor.
- Review settings: Disable any extreme energy-saving or timer functions that may be cycling the unit. Set a reasonable temperature and fan speed.
- Room layout: Avoid directing cold air directly at the sensor area or remote thermostat (if used).
- Consult technician: If short cycling persists, a technician should check refrigerant charge and control logic.
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Repair Difficulty
Medium
3/5
Required Part
Indoor Room Thermistor
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