Toshiba Carrier / Toshiba Carrier 26 High Wall
Toshiba Carrier L31 error code
The Toshiba Carrier table lists L31 as phase sequence error and says abnormal phase sequence of three-phase power was detected. It points to the power supply phase sequence and outdoor PCB.
- Urgency
- stop use
- Verified
- Jul 31, 2026
- Fix path
- Technician
What it means
The Toshiba Carrier table lists L31 as phase sequence error and says abnormal phase sequence of three-phase power was detected. It points to the power supply phase sequence and outdoor PCB.
Urgency
Likely causes
- Three-phase power sequence is incorrect
- A phase-loss or power supply wiring issue is present
- The outdoor PCB phase-detection circuit needs service
Homeowner fix
Turn the system off. Do not reset repeatedly or open electrical panels.
When to call a pro
Call a licensed HVAC technician or qualified electrician for L31. Tell them Toshiba Carrier identifies it as phase-sequence error or three-phase power abnormality.
This code points to electrical or inverter work - get repair quotes from contractors in your area.
Get repair quotesRepair vs replace
Power-phase faults are usually wiring or supply corrections. Replacement is not expected unless the outdoor PCB was damaged.
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: verify three-phase power sequence, phase loss, supply voltage, wiring, and outdoor PCB phase-detection circuit. 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 L and thirty one 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