Toshiba Carrier / Toshiba Carrier 26 High Wall
Toshiba Carrier P19 error code
The Toshiba Carrier table lists P19 as 4-way valve error. It points to the 4-way valve and indoor temperature sensors TC/TCJ, and says the error is due to temperature drop of the indoor heat exchanger during heating.
- Urgency
- advisory
- Verified
- Jul 31, 2026
- Fix path
- Technician
What it means
The Toshiba Carrier table lists P19 as 4-way valve error. It points to the 4-way valve and indoor temperature sensors TC/TCJ, and says the error is due to temperature drop of the indoor heat exchanger during heating.
Urgency
advisory
Schedule service if the code returns or heating does not recover.
Likely causes
- The 4-way valve is not shifting correctly
- Indoor heat exchanger temperature dropped during heating
- Indoor TC or TCJ temperature sensor feedback needs service
- The refrigerant reversing circuit needs professional diagnosis
Homeowner fix
Power cycle once if you can do that safely. Do not open the outdoor unit or handle refrigerant components.
When to call a pro
Call a licensed HVAC technician if P19 returns or heating performance is poor. Tell them Toshiba Carrier identifies P19 as 4-way valve error during heating.
This code points to refrigerant or sealed-system work - get repair quotes from contractors in your area.
Get repair quotesRepair vs replace
Sensor or valve-control issues may be repairable. Compare replacement if a 4-way valve or major refrigerant-circuit repair is required on an older system.
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 4-way valve operation, heating-cycle refrigerant response, TC/TCJ sensors, coil temperature drop, and valve control 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 P and nineteen 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