Toshiba Carrier / Toshiba Carrier 26 High Wall
Toshiba Carrier E31 error code
The Toshiba Carrier table lists E31 as IPDU communication error. It says communication between the IPDU and CDB is abnormal and points to the outdoor unit.
- Urgency
- stop use
- Verified
- Jul 31, 2026
- Fix path
- Technician
What it means
The Toshiba Carrier table lists E31 as IPDU communication error. It says communication between the IPDU and CDB is abnormal and points to the outdoor unit.
Urgency
Likely causes
- The outdoor IPDU and CDB are not communicating
- Outdoor control wiring or connectors need service
- Outdoor power electronics or outdoor PCB needs service
Homeowner fix
Turn the system off and power cycle once only if you can do that safely. Do not open the outdoor unit.
When to call a pro
Call a licensed HVAC technician if E31 returns. Tell them Toshiba Carrier identifies E31 as outdoor IPDU communication error.
This code points to electrical or inverter work - get repair quotes from contractors in your area.
Get repair quotesRepair vs replace
Outdoor control repairs can be significant. Compare repair with replacement if the diagnosis includes major outdoor boards on an older out-of-warranty 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 outdoor IPDU to CDB communication, outdoor connectors, wiring, and outdoor PCB/power electronics. 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 thirty one 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