Toshiba · An established brand in the UK. 70 codes across 4 product families, each taken from the manufacturer’s manuals. Toshiba technical support ↗
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Type the code on your display or a word from its meaning. Each code opens its own page with what it means, whether it is safe and what you can check.
70 codes
| Code | Meaning | Stops? | Homeowner check? |
|---|---|---|---|
| A01 | Flowing quantity failure | Varies by model | Yes |
| A02 | Temperature increase failure (heating) | Partly | Yes |
| A03 | Temperature increase failure (hot water supply) | Partly | Yes |
| A04 | Antifreeze operation (1) | Partly | Yes |
| A05 | Piping antifreeze operation | Partly | Yes |
| A07 | Standard: pressure switch operation; Powerful: incorrect outdoor/hydro matching | Varies by model | Yes |
| A08 | Low pressure sensor operation failure | Partly | Yes |
| A09 | Overheat protection operation | Partly | Yes |
| A10 | Antifreeze operation (2) | Varies by model | Yes |
| A11 | Operation of the release protection | Partly | Yes |
| A12 | Heating, hot water heater failure | Partly | Yes |
| A13 | Pump failure | Partly | Yes |
| A14 | Pump failure | Partly | Yes |
| A15 | Pump failure (for zone 2) | Partly | Yes |
| E01 | No communication between hydro unit and remote controller (detected by remote controller) | Yes | Yes |
| E02 | Defect in signal transmission to the hydro unit (detected by remote controller) | Yes | Yes |
| E03 | Regular communication failure between hydro unit and remote controller | Yes | Yes |
| E04 | Regular communication failure between hydro unit and outdoor unit | Partly | Yes |
| E08 | Duplicate address of hydro unit / duplicate master in group control | Yes | Yes |
| E09 | Several remote controller base units (detected by remote controller) | Yes | Yes |
| E14 | Regular communication failure between hydro unit and 0-10 V interface | Yes | Yes |
| E18 | Regular communication failure between master and slave hydro unit (group control) | Yes | Yes |
| F03 | TC sensor failure | Partly | Yes |
| F04 | TD sensor failure | Partly | Yes |
| F06 | TE sensor failure | Partly | Yes |
| F07 | TL sensor failure | Partly | Yes |
| F08 | TO sensor failure | Partly | Yes |
| F10 | TWI sensor failure | Partly | Yes |
| F11 | TWO sensor failure | Partly | Yes |
| F12 | TS sensor failure | Partly | Yes |
| F13 | TH sensor failure | Partly | Yes |
| F14 | TTW sensor failure | Partly | Yes |
| F15 | TE, TS sensors failure | Partly | Yes |
| F17 | TFI sensor failure | Partly | Yes |
| F18 | THO sensor failure | Partly | Yes |
| F19 | Detection of THO disconnection failure | Partly | Yes |
| F20 | TFI sensor failure | Partly | Yes |
| F23 | Low pressure sensor failure | Partly | Yes |
| F24 | PD sensor failure | Partly | Yes |
| F29 | EEPROM failure (hydro unit) | Yes | Yes |
| F30 | Extended IC failure | Yes | Yes |
| F31 | EEPROM failure | Partly | Yes |
| F32 | Flow sensor failure | Partly | Yes |
| F33 | Flowing quantity failure | Partly | Yes |
| H01 | Compressor breakdown | Partly | Yes |
| H02 | Compressor lock | Partly | Yes |
| H03 | Defect in the current detection circuit | Partly | Yes |
| H04 | Operation of case thermostat | Partly | Yes |
| L02 | Combination failure | Yes | Yes |
| L03 | Duplicate main hydro unit during group control | Yes | Yes |
| L07 | Communication failure | Yes | Yes |
| L08 | Hydro unit group / address unset | Yes | Yes |
| L09 | Communication failure - capability code unset | Yes | Yes |
| L10 | Unset service PC board jumper | Partly | Yes |
| L15 | Combination failure | Varies by model | Yes |
| L16 | Setting failure | Yes | Yes |
| L22 | 0-10 V setting failure | Yes | Yes |
| L29 | Communication failure between outdoor PC board MCUs | Partly | Yes |
| P02 | Converter circuit failure | Partly | Yes |
| P03 | Discharge temperature failure | Partly | Yes |
| P04 | High pressure switch failure | Partly | Yes |
| P05 | Power supply voltage failure | Partly | Yes |
| P07 | Overheating of heat sink failure | Partly | Yes |
| P15 | Detection of gas leak | Partly | Yes |
| P19 | 4-way valve inversion failure | Partly | Yes |
| P20 | High pressure protection operation | Partly | Yes |
| P22 | Outdoor fan system failure | Partly | Yes |
| P26 | Short circuit of compressor driver element | Partly | Yes |
| P29 | Compressor rotor position failure | Partly | Yes |
| P31 | Slave hydro unit failure following master hydro unit failure | Yes | Yes |