HeatingCodesDaikin FTXC mini-split error codes
Daikin wall-mounted units flash a code on the indoor unit and show it on the remote. This is a service manual, so the full troubleshooting flow charts assume a trained technician with meters, but the code list itself tells you which part of the system the unit is complaining about.
How to read the display
Codes starting with A or C are indoor unit faults. Codes starting with E, F, H, J, L or P are outdoor unit faults. U codes are system-level (voltage, communication, installation).
The service manual tells technicians to turn the power switch off before connecting or disconnecting connectors, because parts can be damaged. That is one more reason the deeper steps are not for homeowners.
Daikin code table
| Code | Meaning | What the document says |
|---|---|---|
| 00 | Normal condition | |
| U2 | Low-voltage detection or over-voltage detection | |
| U4 | Signal transmission error (between indoor unit and outdoor unit) | |
| UA | Installation error (between indoor unit and outdoor unit) | |
| A1 | Indoor unit PCB abnormality | |
| A5 | Freeze-up protection control | |
| A6 | Indoor fan motor (DC motor) or related abnormality | |
| C4 | Indoor heat exchanger thermistor or related abnormality | |
| C9 | Room temperature thermistor or related abnormality | |
| E1 | Outdoor unit PCB abnormality | |
| E3 | Actuation of high pressure switch | |
| E6 | Compressor lock | |
| E7 | DC fan lock | |
| E8 | Input overcurrent detection | |
| F3 | Discharge pipe temperature control | |
| F6 | High pressure control in cooling | |
| EA | Four way valve abnormality | |
| H0 | Compressor sensor system abnormality | |
| H6 | Position sensor abnormality | Compressor start-up failure detected through the position detection circuit. See the H6 page. Full explanation |
| H9 | Outdoor temperature thermistor or related abnormality | |
| J3 | Discharge pipe thermistor or related abnormality | |
| J6 | Outdoor heat exchanger thermistor or related abnormality | |
| L3 | Electrical box temperature rise | |
| L4 | Radiation fin temperature rise | |
| L5 | Output overcurrent detection | |
| P4 | Radiation fin thermistor or related abnormality |
Source: Daikin DAMA-SM-23-020, section 4.1 "Error Codes and Description". P4 is displayed only when the system is shut down, per the manual.
Detailed explanations
Sources
- Service Manual DAMA-SM-23-020: Inverter Split Wall Mounted Heat Pump, FTXC Series (section 4.1 and 4.20) (Daikin) Covers: Daikin FTXC-series inverter wall-mounted heat pumps (60 Hz).