Tosot Loss of Cooling / Reversing Valve or Refrigerant Issue

Unit blows warm air in cooling mode

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

Refrigerant leak, Stuck 4-way reversing valve (heat pump models), Compressor not running, Indoor or outdoor fan failure

Safety first: Turn off power before inspecting outdoor components.

Check mode setting: Ensure the remote is set to COOL and not FAN or HEAT.
Verify compressor operation: Listen at the outdoor unit for compressor running. If silent, see compressor non-start troubleshooting.
Check fans: Confirm both indoor and outdoor fans are running.
If still warm air: A technician should check refrigerant charge and test the reversing valve operation. Replace the valve or repair leaks as needed.

Hard 4/5

4-Way Reversing Valve

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