Toshiba Carrier / Toshiba Carrier 26 High Wall
Toshiba Carrier F08 error code
The Toshiba Carrier table lists F08 as outdoor outside air temperature sensor error. It says an open or short circuit has been detected and lists the TO outdoor temperature sensor and outdoor PCB as parts to check.
- Urgency
- advisory
- Verified
- Jul 31, 2026
- Fix path
- Technician
What it means
The Toshiba Carrier table lists F08 as outdoor outside air temperature sensor error. It says an open or short circuit has been detected and lists the TO outdoor temperature sensor and outdoor PCB as parts to check.
Urgency
advisory
The manual says operation may continue, but the outdoor air sensor needs service.
Likely causes
- The outdoor outside-air TO sensor circuit is open or shorted
- The TO sensor connector or harness needs service
- The outdoor PCB sensor input needs service
Homeowner fix
Power cycle once if you can do that safely. Make sure the outdoor unit is not buried in debris, but do not open the cabinet.
When to call a pro
Call a licensed HVAC technician if F08 returns. Tell them Toshiba Carrier identifies F08 as outdoor outside-air TO sensor error.
This code points to electrical or inverter work - get repair quotes from contractors in your area.
Get repair quotesRepair vs replace
Outdoor air sensor faults are usually repairable and do not by themselves justify replacement.
See Toshiba Carrier mini-splitsYour Toshiba Carrier model
Toshiba Carrier 26 High Wall model pages in the Toshiba Carrier catalog help compare this repair path with current replacement options.
- Toshiba Carrier 26 High Wall 12,000 BTU R-454B 208/230V (RAV-HB121KRTP-UL / RAV-BP121AT2P-UL)
Toshiba Carrier 26 High Wall
- Toshiba Carrier 26 High Wall 18,000 BTU R-454B 208/230V (RAV-HB181KRTP-UL / RAV-BP181AT2P-UL)
Toshiba Carrier 26 High Wall
- Toshiba Carrier 26 High Wall 24,000 BTU R-454B 208/230V (RAV-HB241KRTP-UL / RAV-BP241AT2P-UL)
Toshiba Carrier 26 High Wall
- Toshiba Carrier 26 High Wall 30,000 BTU R-454B 208/230V (RAV-HB301KRTP-UL / RAV-BP301AT2P-UL)
Toshiba Carrier 26 High Wall
For your technician
Technician note: inspect TO outside-air sensor, connector, harness, and outdoor PCB input for open/short detection. Page context: Toshiba Carrier maps this display to the Toshiba Carrier 26 High Wall line; source: Toshiba Carrier RAV High Wall 12K-36K Installation Manual, Section 14 Troubleshooting, Error codes and parts to be checked; display convention: match the letter F and eight marker exactly before comparing neighboring codes.
Which systems show it
Toshiba Carrier 26 High Wall
Related troubleshooting
Use the symptom guide alongside the exact display code if the unit is flashing, cycling, or showing comfort symptoms.
Related codes
Source
- Document
- Toshiba Carrier RAV High Wall 12K-36K Installation Manual, Section 14 Troubleshooting, Error codes and parts to be checked