Lennox · Air Conditioning
The refrigerant system pressure has risen too high, activating a safety protection. This can be due to various factors hindering proper refrigerant flow.
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Ensure indoor and outdoor coils are clean and airflow is unrestricted.
Check that the outdoor fan is running correctly.
Verify that refrigerant lines are not kinked or blocked.
A technician must check refrigerant levels and system pressures.