Cosmo F2 error code

What it means

F2 is part of TOSOT Direct's temperature sensor malfunction group. It means the unit is seeing an invalid temperature input and may shut down to protect itself.

Urgency

Likely causes

1. Faulty pipe or coil temperature sensor
2. Disconnected sensor plug
3. Open or shorted sensor wiring
4. Indoor control board sensor input fault

Homeowner fix

Turn the system off for 10 minutes, then restart once. Do not remove panels or replace the sensor yourself.

When to call a pro

Call a licensed HVAC technician if F2 returns after one reset or the indoor unit cycles incorrectly.

Repair vs replace

Sensor repairs are normally repair-first items. Consider replacement only if an older unit also needs a board or refrigerant-circuit repair.

• Cosmo Series 9,100 BTU R-32 115V (GWH09AWCXB-A6DN***/I / GWH09ATCXB-A6DNA1C/O)

  Cosmo Series

• Cosmo Series 9,100 BTU R-32 208/230V (GWH09AWCXB-D6DN***/I / GWH09ATCXB-D6DNA1C/O)

  Cosmo Series

• Cosmo Series 12,000 BTU R-32 115V (GWH12AWCXB-A6DN***/I / GWH12ATCXB-A6DNA1A/O)

  Cosmo Series

• Cosmo Series 12,000 BTU R-32 208/230V (GWH12AWCXB-D6DN***/I / GWH12ATCXB-D6DNA1A/O)

  Cosmo Series

For your technician

Technician note: verify the model-specific F2 sensor, check harness and connector, compare resistance with actual coil temperature, and confirm PCB input response. Page context: Cosmo maps this display to the Cosmo Series line; source: TOSOT Direct Cosmo Series product-document manual links plus TOSOT Direct mini-split error-code guide and FAQ; display convention: match the letter F and two marker exactly before comparing neighboring codes.

Which systems show it

Cosmo Series

Sold under more than one brand

Shared with TOSOT. Cosmo and TOSOT document this code from the same manufacturer source, so F2 means the same thing on either badge and the steps above apply.

Related troubleshooting

Use the symptom guide alongside the exact display code if the unit is flashing, cycling, or showing comfort symptoms.

Related codes

Source

Next step