Error code · Room Air Conditioner

LG Air Conditioner Codes F1, F2, F3: Fan Speed Readout

F1, F2, and F3 on LG room air conditioners, meaning plug-in window and portable units that show CH codes, tell you the current fan speed. F1 is weak, F2 is mid, and F3 is strong. These…

Low risk · DIY check OK

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Code: F1, F2, F3
Appliance: Room Air Conditioner
Brand: LG
Warranty: 30-day workmanship

What F1, F2, F3 means

F1, F2, and F3 on LG room air conditioners, meaning plug-in window and portable units that show CH codes, tell you the current fan speed. F1 is weak, F2 is mid, and F3 is strong. These are not error codes. The owner sees the letter and number when pressing the fan button, and may worry that the unit is signaling a problem. Be aware that on other LG platforms, F2 and F3 are grouped with sensor codes, so the type of unit you own decides which reading applies.

Common causes of F1, F2, F3

Fan speed button pressed on the remote or panel
Display showing the chosen airflow level

✓ One safe check you can try

1. Press the fan speed button on the remote or on the unit's panel. 2. Watch the readout step between F1, F2, and F3 with each press. 3. Pick the level that suits the room, weak, mid, or strong. 4. Hold your hand near the vent to check that the airflow really changes as the display changes.

! Why to stop there

If the readout does not change when you press the button, we test the button panel and the fan speed control.
If the fan speed does not match the readout, we check the fan motor and its control.
You get a written price before any repair.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

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Other Room Air Conditioner codes

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F1, F2, F3F1, F2, F3 questions

Does F3 mean something is wrong?

On a room air conditioner, F3 means the fan is on the strong setting. It is the top speed and not an alarm, so no repair is needed when you see it.

Why do F2 and F3 look different on other LG units?

On some other LG platforms, F2 and F3 are listed among the sensor-related codes. For a plug-in room unit they are fan speeds, so match the reading to your own unit type before worrying.

How do I change from F1 to F3?

Press the fan speed button until the readout reaches the level you want. Each press moves through weak, mid, and strong in turn, and the airflow should change to match what the display shows.

Book a visit

Still unsure about F1, F2, F3?

A technician diagnoses it on site and gives you the price in writing before any work starts.

(713) 597-5662