Toshiba Carrier / Toshiba Carrier 26 High Wall
Toshiba Carrier P05 error code
The Toshiba Carrier table lists P05 as open phase detected. It says the power wire may be connected incorrectly and directs checking open phase and power supply voltages.
- Urgency
- stop use
- Verified
- Jul 31, 2026
- Fix path
- Technician
What it means
The Toshiba Carrier table lists P05 as open phase detected. It says the power wire may be connected incorrectly and directs checking open phase and power supply voltages.
Urgency
Likely causes
- A power supply phase is open
- Power wiring is connected incorrectly
- Power supply voltages are abnormal
- Outdoor electrical detection needs service
Homeowner fix
Turn the system off. Do not reset repeatedly, open panels, or move wiring.
When to call a pro
Call a licensed HVAC technician or qualified electrician for P05. Tell them Toshiba Carrier identifies P05 as open phase detected with power wiring and voltage checks.
This code points to electrical or inverter work - get repair quotes from contractors in your area.
Get repair quotesRepair vs replace
Power-supply or wiring faults are usually correctable. Replacement is considered only if electrical damage has already harmed major boards or the compressor.
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: check open phase, incoming power voltages, power wiring correctness, terminals, and outdoor electrical protection circuits. 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 P and five 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