Toshiba ductless-mini-split — Toshiba residential and light-commercial systems fitted with a wired remote controller Error Codes Directory

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.