Toshiba Error Codes & Diagnostics
Complete diagnostic directory for official Toshiba fault codes. Verify root causes, safe troubleshooting steps, and replacement part numbers before calling a technician.
Toshiba E01, E02, E03 error codes: wired controller communication
Toshiba uses E01, E02, and E03 for a communication break between the wired remote controller and the indoor unit. E01 is raised at the controller when it stops hearing the indoor unit, E02 is a controller transmission fault, and E03 is raised when the indoor unit receives nothing from the controller or network adaptor. Applies to: Toshiba residential and light-commercial systems fitted with a wired remote controller This applies to Toshiba systems with a wired wall controller that report the E0-series codes. Wireless-remote systems that signal faults by flashing indoor lamps use a different scheme, so confirm the installation has a wired controller before applying this page. Owner-safe checks: Record the exact code, E01, E02, or E03, whether the controller screen is blank or working, and whether the system was rewired or altered recently. | Check whether the indoor unit has power at its own supply, without opening any covers. Qualified technician: Checking the controller cable at the terminals, testing continuity, and swapping a controller or board to isolate the fault require a qualified technician.
Toshiba P-series protections: what the handbook groups under one letter
Toshiba organises its fault codes by leading letter, and the P-series marks protective shutdowns rather than component failures. A P code means the equipment measured a condition outside its permitted range and stopped itself, which is a materially different statement from an E code reporting a communication or controller problem. Applies to: Toshiba air conditioning equipment using the fault code tables published in the Toshiba United Kingdom technical handbook Toshiba's technical handbook covers a wide range of equipment sold in the United Kingdom, and the same code can appear against different subsystems on residential and on larger commercial equipment. Take the model from the outdoor and indoor data plates and read the code against the handbook table for that family. Owner-safe checks: Photograph the controller showing the complete code, including the letter and every digit that follows it. | Copy the indoor and outdoor model numbers from their data plates so the correct handbook table can be used. | Deal with the two airflow variables you can reach: wash the indoor filters and open up the space around the outdoor casing. Qualified technician: Refrigerant measurement, leak detection, and coil cleaning are certified activities under EPA Section 608 in the United States and F-Gas rules in the United Kingdom and European Union. | Repeatedly restarting a system that keeps reaching a protection puts the equipment back into the condition the protection stopped, which is worth avoiding.