Toshiba Carrier / Toshiba Carrier 26 High Wall
Toshiba Carrier P04 error code
The Toshiba Carrier table lists P04 as outdoor high-pressure system error. It points to the high-pressure switch and says IOL activated or high-pressure releasing control using TE is in error.
- Urgency
- stop use
- Verified
- Jul 31, 2026
- Fix path
- Technician
What it means
The Toshiba Carrier table lists P04 as outdoor high-pressure system error. It points to the high-pressure switch and says IOL activated or high-pressure releasing control using TE is in error.
Urgency
Likely causes
- High-pressure protection or IOL has activated
- The high-pressure switch circuit needs service
- High-pressure releasing control using the TE sensor needs service
- The refrigerant circuit or outdoor airflow needs professional diagnosis
Homeowner fix
Turn the system off. Make sure the outdoor unit is not blocked by leaves or objects outside the cabinet, but do not open it or connect gauges.
When to call a pro
Call a licensed HVAC technician for P04. Tell them Toshiba Carrier identifies P04 as outdoor high-pressure system error.
This code points to refrigerant or sealed-system and electrical or inverter work - get repair quotes from contractors in your area.
Get repair quotesRepair vs replace
Pressure faults may be repairable airflow, sensor, or refrigerant issues. Compare replacement if major compressor or coil repair is confirmed on an older unit.
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 high-pressure switch, IOL condition, TE-based high-pressure releasing control, outdoor airflow, refrigerant circuit, 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 four 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