Panasonic AC Error Code F2 — What It Means & How to Fix It

What Does This Error Mean?

F2 on a Panasonic AC means the indoor pipe (evaporator coil) temperature thermistor has a fault. This sensor monitors the indoor heat exchanger coil temperature to prevent icing and regulate the refrigerant cycle. F2 triggers a protective shutdown to prevent the coil from freezing.

Affected Models

Panasonic Inverter Split AC (all capacities)
Panasonic CS-SU series
Panasonic CS-YU series
Panasonic CS-XU series
Panasonic NanoeX series

Common Causes

Indoor pipe thermistor failed — open or short circuit
Thermistor probe dislodged from the evaporator coil pipe
Air filter blocked — reduced airflow causes the coil to over-cool
Refrigerant overcharge causing abnormally low coil temperature
Indoor PCB fault causing incorrect coil thermistor reading

How to Fix It

Clean the air filter immediately.

Remove the front panel, slide out the filter, wash under a tap and allow to dry fully before reinstalling. A blocked filter is the most common cause of F2 on Panasonic ACs.
Switch off for 15 minutes to allow the coil to defrost.

If ice has started to form on the evaporator coil, allow complete defrost before restarting. Look for ice on the copper pipes coming out of the indoor unit.
Restart and set temperature to 24–26 degrees C with fan on medium or high.

Very low set temperatures in an already cool room can cause the coil to over-cool and retrigger F2 even after defrosting.
Call Panasonic service (1800-103-1333) if F2 persists after filter cleaning.

The technician will confirm whether the thermistor, refrigerant charge, or PCB is the root cause.

When to Call a Professional

F2 requires a Panasonic authorised technician if filter cleaning does not resolve it. Panasonic India: 1800-103-1333. The technician will test thermistor resistance and check refrigerant operating pressures.

Frequently Asked Questions

Can I see if the Panasonic AC coil is frozen before calling for service?

Yes — open the front panel of the indoor unit and look at the evaporator coil (the aluminium fin section). If you see frost or ice on the coil or on the copper pipes, the coil has started to freeze. Switch off immediately and allow to defrost before assessing whether the problem recurs.