Tosot Outdoor Coil Icing (Cooling Mode) or Abnormal Defrost (Heating Mode)

Frost or ice forming on outdoor unit piping or coil

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.

Possible Causes

Low refrigerant charge, Restricted airflow across outdoor coil, Defective defrost sensor or control (in heating), Very low outdoor temperature in cooling mode

How to Fix / Troubleshooting

Safety first: Turn off power before removing ice manually. Do not use sharp tools.

Clear airflow: Remove debris and ensure proper clearance around the outdoor unit.
Clean coil: Wash the outdoor coil to improve heat exchange.
Observe defrost (heat pump): In heating mode, occasional icing is normal if the unit defrosts periodically. If ice never melts, defrost control may be faulty.
Professional service: Persistent icing requires a technician to check refrigerant charge and defrost controls.

Repair Difficulty

Hard 4/5

Required Part

Outdoor Defrost Temperature Sensor

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