Toshiba Carrier / Toshiba Carrier 26 High Wall
Toshiba Carrier E10 error code
The Toshiba Carrier table lists E10 as CPU-CPU communication error. It points to the indoor PCB and says communication between the main MCU and motor microcomputer MCU is abnormal.
- Urgency
- advisory
- Verified
- Jul 31, 2026
- Fix path
- Technician
What it means
The Toshiba Carrier table lists E10 as CPU-CPU communication error. It points to the indoor PCB and says communication between the main MCU and motor microcomputer MCU is abnormal.
Urgency
advisory
Indoor electronics need service if one reset does not clear it.
Likely causes
- The indoor main MCU is not communicating with the motor microcomputer MCU
- The indoor PCB has an internal communication fault
- A connector or power issue on the indoor control board needs service
Homeowner fix
Power cycle once if you can do that safely. Do not open the indoor cabinet or touch the control board.
When to call a pro
Call a licensed HVAC technician if E10 returns. Tell them Toshiba Carrier identifies E10 as indoor PCB CPU-to-CPU communication trouble.
This code points to electrical or inverter work - get repair quotes from contractors in your area.
Get repair quotesRepair vs replace
Indoor PCB repair or replacement can be reasonable on a newer unit. Compare replacement if the system is older and multiple boards are involved.
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 indoor PCB power, connectors, main MCU to motor MCU communication, and board condition. 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 E and ten 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