Toshiba Carrier / Toshiba Carrier 26 High Wall
Toshiba Carrier P03 error code
The Toshiba Carrier table lists P03 as outdoor discharge temperature error and describes it as an error in discharge-temperature releasing control.
- Urgency
- stop use
- Verified
- Jul 31, 2026
- Fix path
- Technician
What it means
The Toshiba Carrier table lists P03 as outdoor discharge temperature error and describes it as an error in discharge-temperature releasing control.
Urgency
Likely causes
- Discharge-temperature releasing control could not keep temperature in range
- The outdoor discharge temperature sensor or circuit needs service
- The refrigerant circuit or compressor operating condition needs professional diagnosis
Homeowner fix
Turn the system off if P03 returns. Do not keep resetting it or open the outdoor unit.
When to call a pro
Call a licensed HVAC technician for P03. Tell them Toshiba Carrier identifies it as outdoor discharge-temperature releasing-control error.
This code points to refrigerant or sealed-system, compressor, and electrical or inverter work - get repair quotes from contractors in your area.
Get repair quotesRepair vs replace
The repair depends on whether the cause is sensor, airflow, refrigerant, or compressor related. Compare replacement for major compressor or refrigerant-circuit repairs on older equipment.
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 discharge temperature control, TD sensor, outdoor airflow, refrigerant circuit, compressor operation, and outdoor PCB. 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 three 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