Hitachi Low Pressure Protection / Evaporator Freeze Protection

Unit stops with F6, may occur at low outdoor temperatures 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

Low refrigerant charge, Blocked indoor airflow (dirty filters/coil), Indoor fan not running properly, Faulty low‑pressure sensor

Safety first: Turn OFF the unit and allow any ice on the indoor coil to melt completely.

Steps:

Clean filters and coil: Ensure maximum indoor airflow.
Check fan operation: Run in fan‑only mode and verify strong airflow on all speeds.
Room conditions: Avoid running cooling at very low set temperatures in already cool rooms; this can cause coil freezing.

If F6 continues: A professional should check refrigerant charge and low‑pressure sensor operation.

Hard 4/5

Low‑Pressure Sensor / Refrigerant Circuit

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