Mitsubishi: Freeze-Up or Overheat Protection

What this fault means

The unit tripped a protection because the indoor coil iced up in cooling or ran too hot — a P6-type protection on Mitsubishi systems.

Likely causes

• Dirty filters or coil restricting airflow
• Low refrigerant charge
• Blocked indoor/outdoor airflow
• Fan fault

What you can safely check

• Replace a dirty air filter — restricted airflow causes a surprising share of furnace faults.
• Confirm registers and the outdoor unit are clear of snow, leaves and debris.
• Cycle power at the switch once and let the system retry.

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