Knowledge base
Toshiba fault codes
Estia • Seiya
Toshiba Estia and Seiya fault-code hub for installers. Code 07 (Seiya), serial communication 04, inverter overcurrent 14, Estia water-flow A01 and high-pressure P04 — causes and field procedures from AskMarcel manuals.
Toshiba fault codes by product family
A code can mean different things depending on the range: open the sheet for the exact model.
P04 • RAV / Tertiaire
Fault Code P04 Toshiba: Compressor Fault — Diagnosis
Fault code P04 is a physical safety triggered by the high-pressure switch on the Toshiba outdoor unit. The pressure has exceeded the critical threshold. The same logic applies to wall-mounted air conditioning units or RAV heat pumps.
04 • Seiya / Shorai / RAV
Toshiba fault code 04: Serial communication fault (S3 link)
Code 04 is the most common fault on Toshiba units. It indicates a missing signal on the serial communication line (terminal S3) between the indoor unit and the outdoor unit.
07 • Seiya
Fault Code 07 Toshiba Seiya: Overheating — Solution
Fault code 07 is often related to a feedback problem (sensor/communication) or component operation (depending on series). Diagnosis involves checking connectors, power supply and associated parts.
14 • Digital Inverter / Super Digital
Fault Code 14 Toshiba: Compressor — Diagnostic Steps
Fault code 14 indicates that the inverter circuit has detected an abnormally high current. This is a major protection to prevent burning out the compressor or the board.
A01 • Estia (Air/Eau)
Fault code A01 Toshiba Estia: Water flow fault
Specific to Estia Air/Water heat pumps, code A01 indicates that the flow controller does not detect sufficient water circulation to transfer heat.
1C • Depends on Toshiba range and model
Toshiba 1C: meaning depends on the model
Code 1C is not a universal compressor fault across Toshiba systems. A RAS service manual and a Toshiba technical handbook assign different meanings to this code. Use the fault table for the exact equipment reference.
P10 • Supported Toshiba VRF cassettes; check the model
Toshiba P10 cassette: indoor condensate overflow protection
On Toshiba cassettes covered by the MMU-UP_1YHP-E service manual, P10 indicates indoor overflow trouble. The float switch or its circuit may be faulty; the code alone does not identify a failed pump.
1E • RAV / Estia
Fault code 1E Toshiba: Excessive discharge temperature
Code 1E is a critical safety: the temperature measured at the compressor outlet (TD sensor) exceeds the limit (often > 110°C).
0d • Seiya / Shorai
Fault code 0d Toshiba: Indoor heat exchanger sensor (TC)
Fault code 0d indicates a problem with the temperature sensor clipped onto the indoor unit heat exchanger (TC sensor). It is used for cooling and overheating management.
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