Atlantic Alfea Excellia DUO Air-to-Water Heat Pump – Error Code List
List of error codes for the Atlantic Alfea Excellia DUO air-to-water heat pump
Download the manual for the Atlantic Alfea Excellia DUO air-to-water heat pump
Before you begin, here are the most common error codes
- Error code 10 : outdoor sensor fault.
- Error code 50 : DHW temperature sensor fault.
- Error code 60 : room sensor 1 fault.
- Error code 121 : CC1 outlet temperature not reached.
- Error code 370 : outdoor unit error.
If you can’t find the solution to your problem, you can go directly to the Atlantic manufacturer’s website to look up the issue based on your error code.
Faults displayed on the hydraulic module
Before any work, make sure the main power supply is switched off.
When the heat pump is not powered on, frost protection is not guaranteed.
Depending on whether the fault comes from the outdoor unit or the hydraulic module, it may be shown on the digital display or via the LED on the interface boards.
Faults or failures of the hydraulic module are indicated on the user interface display.
The display shows the symbol 
Press the 
key to get details about the cause of the fault.
Once the error is resolved, the faults are automatically reset to zero.
Hydraulic module : Faults visible on the digital display.
| Error code | Error description | Error location | Heat pump operation despite the error |
| – | No connection. | The room sensor’s polarity is not respected. | No |
| 10 | Outdoor sensor. | B9 | Yes |
| 33 | Heat pump outlet temperature sensor error. | B21 | Yes |
| 44 | Heat pump return temperature sensor error. | B71 | Yes |
| 50 | DHW temperature sensor. | B3 | Yes |
| 60 | Room sensor 1. | Yes | |
| 65 | Room sensor 2. | Yes | |
| 105 | Maintenance message. | Yes | |
| 121 | CC1 outlet temperature not reached. | Yes | |
| 122 | CC2 outlet temperature not reached. | Yes | |
| 127 | Anti-legionella temperature not reached. | Yes | |
| 369 | External fault (safety device). | No | |
| 370 | Outdoor unit error
(during a startup phase, see “Commissioning” section). |
see below. | No |
| 441 | Zone 2 sensor not configured (if 2-circuit kit) | BX31; Set parameter 5700 to 2, 4, or 6 | No |
Hydraulic module : Blinking LED visible on the interface board.
| Outdoor unit error number | LED display |
Error description |
|
| LED 2 (green) | LED 1 (red) | ||
| 11 | 1 Flash | 1 Flash | Communication error between the hydraulic module and the outdoor unit. |
| 23 | 2 Flashes | 3 Flashes | Connection forbidden (serial connection error). |
| 31 | 3 Flashes | 1 Flash | Hydraulic module power supply error. |
| 32 | 3 Flashes | 2 Flashes | Communication error between the controller and the user interface. |
| 41 | 4 Flashes | 1 Flash | Connection error between the hydraulic module and the outdoor unit. |
| 42 | 4 Flashes | 2 Flashes | Hydraulic module heat exchanger temperature sensor error. |
| 61 | 6 Flashes | 1 Flash | Outdoor unit power supply error. |
| 62 | 6 Flashes | 2 Flashes | Outdoor unit control board error. |
| 63 | 6 Flashes | 3 Flashes | Inverter error. |
| 64 | 6 Flashes | 4 Flashes | Active filter error. |
| 65 | 6 Flashes | 5 Flashes | IPM board error. |
| 67 | 6 Flashes | 7 Flashes | Outdoor unit power micro-cutoff (protection operation). |
| 68 | 6 Flashes | 8 Flashes | Outdoor unit magnetic relay error. |
| 71 | 7 Flashes | 1 Flash | Discharge temperature sensor error. |
| 72 | 7 Flashes | 2 Flashes | Compressor temperature sensor error. |
| 73 | 7 Flashes | 3 Flashes | Heat exchanger temperature sensor error (outlet / center). |
| 74 | 7 Flashes | 4 Flashes | Outdoor temperature sensor error. |
| 77 | 7 Flashes | 7 Flashes | Outdoor unit radiator temperature error. |
| 78 | 7 Flashes | 8 Flashes | Expansion valve temperature sensor error. |
| 84 | 8 Flashes | 4 Flashes | Compressor current error. |
| 86 | 8 Flashes | 6 Flashes | Pressure switch sensor error / Pressure sensor error. |
| 94 | 9 Flashes | 4 Flashes | Current sensor error. |
| 95 | 9 Flashes | 5 Flashes | Compressor rotor position detection error. Compressor startup error. |
| 97 | 9 Flashes | 7 Flashes | Outdoor unit fan 1 error. |
| 98 | 9 Flashes | 8 Flashes | Outdoor unit fan 2 error. |
| A1 | 10 Flashes | 1 Flash | Discharge temperature protection. |
| A3 | 10 Flashes | 3 Flashes | Compressor temperature protection. |
| A4 | 10 Flashes | 4 Flashes | Outdoor unit pressure error. |
| A5 | 10 Flashes | 5 Flashes | Abnormally low pressure. |
| A9 | 10 Flashes | 9 Flashes | Overcurrent error. |
| Continuous flashing
(1 sec on / 1 sec off) |
Recovery operation. | ||
| – | Steady on | Off | Defrosting. |
Faults displayed on the single-phase outdoor unit
To access the circuit board, you need to remove the (right) front panel of the outdoor unit. Faults are indicated by LED flash codes.
When an error occurs:
- The “ERROR” LED (2) flashes.
- Press the “ENTER” button (SW3) once.
- The “ERROR” LED (2) flashes a number of times depending on the type of error (see table below).
figure 48 – Location of the switches and LED on the single-phase outdoor unit
| LED display | Error description |
| 1 Flash | Serial communication feedback error. |
| 2 Flashes | Discharge temperature sensor error. |
| 3 Flashes | Pressure switch sensor error. |
| 4 Flashes | Heat exchanger outlet temperature sensor error. |
| 5 Flashes | Intermediate heat exchanger temperature sensor error. |
| 6 Flashes | Expansion valve temperature sensor error. |
| 7 Flashes | Outdoor temperature sensor error. |
| 8 Flashes | Compressor temperature sensor error. |
| 9 Flashes | Radiator temperature sensor error. |
| 11 Flashes | Discharge temperature protection (permanent shutdown). |
| 12 Flashes | Compressor temperature protection (permanent shutdown). |
| 13 Flashes | Current sensor error (permanent shutdown). |
| 14 Flashes | Compressor rotor position detection error (permanent shutdown). |
| 15 Flashes | Compressor startup error (permanent shutdown). |
| 16 Flashes | Fan motor 1 error (permanent shutdown). |
| 17 Flashes | Fan motor 2 error (permanent shutdown). |
| 18 Flashes | Inverter error. |
| 19 Flashes | Active filter error. |
| 20 Flashes | Abnormally low pressure. |
| 22 Flashes | Hydraulic module malfunction. |
Faults displayed on the three-phase outdoor unit
To access the circuit board, you need to remove the (right) front panel of the outdoor unit. Faults are indicated by LED flash codes. When an error occurs:
- The “ERROR” LED (2) flashes.
- Press the “ENTER” button (SW4) once.
- The “ERROR” LED (2) blinks several times depending on the type of error (see table below).
| Diode display | Error label |
| 1 Flash | Serial communication return error. |
| 2 Flashes | Discharge temperature sensor error. |
| 3 Flashes | Pressure switch sensor error. |
| 4 Flashes | Exchanger outlet temperature sensor error. |
| 5 Flashes | Intermediate exchanger temperature sensor error. |
| 6 Flashes | Expansion valve temperature sensor error. |
| 7 Flashes | Outdoor temperature sensor error. |
| 8 Flashes | Compressor temperature sensor error. |
| 9 Flashes | Inverter radiator temperature sensor error. |
| 10 Flashes | P.F.C. radiator temperature sensor error. |
| 11 Flashes | Discharge temperature protection (permanent shutdown). |
| 12 Flashes | Compressor temperature protection (permanent shutdown). |
| 13 Flashes | Current sensor error (permanent shutdown). |
| 14 Flashes | Compressor rotor position detection error (permanent shutdown). |
| 15 Flashes | Compressor startup error (permanent shutdown). |
| 16 Flashes | Fan motor 1 error (permanent shutdown). |
| 17 Flashes | Fan motor 2 error (permanent shutdown). |
| 18 Flashes | Inverter error. |
| 19 Flashes | P.F.C. error. |
| 20 Flashes | Abnormally low pressure. |
| 22 Flashes | Hydraulic module malfunction. |