List of error codes for the De Dietrich Alezio S V200 air-to-water heat pump
List of error codes for the indoor unit – De Dietrich Alezio S V200
- MIV-4S/E 4-8 V200
- MIV-4S/E 11-16 V200
- MIV-4S/H 4-8 V200
- MIV-4S/H 11-16 V200
Download the manual for the De Dietrich Alezio S V220
Tab.85 List of temporary error codes
| Code
error |
Message | Description |
| H00.17 | DHW tank sensor opené | The domestic hot water tank sensor is short-circuited or the reading is above range
Check the wiring between the control board and the sensor. Check that the sensor was installed correctly. Check the sensor’s resistance value. Replace the sensor if necessary. |
| H00.32 | Text open | The outdoor temperature sensor is missing or a temperature below range is being measured
Check the wiring between the control board and the sensor. Check that the sensor was installed correctly. Check the sensor’s resistance value. Replace the sensor if necessary. |
| H00.33 | Textéoutdoor sensor shortedé | The outdoor sensor is short-circuited or the measured temperature is above range
Check the wiring between the control board and the sensor. Check that the sensor was installed correctly. Check the sensor’s resistance value. Replace the sensor if necessary. |
| H00.47 | Sensoréheat pump flow missing or temp<range | The heat pump flow sensor is missing or a temperature below range is being measured
Check the wiring between the control board and the sensor. Check that the sensor was installed correctly. Check the sensor’s resistance value. Replace the sensor if necessary. |
| H00.48 | FDéHP flow shortedé | The heat pump flow sensor is short-circuited or a measured temperature > range
Check the wiring between the control board and the sensor. Check that the sensor was installed correctly. Check the sensor’s resistance value. Replace the sensor if necessary. |
| H00.49 | FDéHP flow missing | Heat pump flow temperature sensor expected but not detected
Check the wiring between the control board and the sensor. Check that the sensor was installed correctly. Check the sensor’s resistance value. Replace the sensor if necessary. |
| H00.51 | HP return open | The heat pump return sensor is missing or a temp below range
is being measured |
| H00.52 | HP return shortedé | The heat pump return sensor is shorted or a temperature above range is being measured
Check the wiring between the control board and the sensor. Check that the sensor was installed correctly. Check the sensor’s resistance value. Replace the sensor if necessary. |
| H00.57 | DHW high sensor open | The DHW tank’s high sensor is missing or a temperature below range is being measured
Check the wiring between the control board and the sensor. Check that the sensor was installed correctly. Check the sensor’s resistance value. Replace the sensor if necessary. |
| H00.58 | DHW high sensor shortedé | The DHW tank’s high sensor is short-circuited or the measured temperature > range
Check the wiring between the control board and the sensor. Check that the sensor was installed correctly. Check the sensor’s resistance value. Replace the sensor if necessary. |
| Code
error |
Message | Description |
| H02.00 | Réinit. in progress | Reset in progress |
| H02.02 | Waiting for config no. | Waiting for the configuration number to be entered
Waiting for configuration parameters to be entered Configure CN1 / CN2 according to the capacity of the installed outdoor unit (CNF menu). Control board replaced: heat pump not configured |
| H02.03 | Config error | Configuration error
The configuration parameters entered are incorrect. Configure CN1 / CN2 according to the capacity of the installed outdoor unit (CNF menu). |
| H02.04 | Parameter errorè | Parameter error
Restore the factory settings. If the error is still present: replace the control board. Unable to read parameters from the electronic board Configure CN1 / CN2 according to the capacity of the installed outdoor unit (CNF menu). Check that the settings are correct. |
| H02.05 | CSU and CU mismatch | The CSU is not compatible with the CU
Software change (software number or version parameter inconsistent with what is stored in memory). |
| H02.07 | Water pressure error | Water pressure error active
Check the hydraulic pressure in the heating circuit. Check the wiring between the control board and the pressure sensor. Check the pressure sensor’s connection. |
| H02.09 | Partial lockout | Partial lockout of the unit detected
Input BL of the open central unit board terminal block Check the contact on input BL. Check the wiring. Check parameters AP001 and AP100. |
| H02.10 | Complete lockout | Complete lockout of the recognized appliance
Input BL of the open central unit board terminal block Check the contact on input BL. Check the wiring. Check parameters AP001 and AP100. |
| H02.23 | Flow ErroréWater | Water flow is below the allowed limit Flow problem
Insufficient flow: open a radiator valve. The circuit is clogged: Check that the filters are not clogged and clean them if necessary. Clean and flush the system, No circulation: Check that the valves and thermostatic valves are open, Check that the circulator pump is working, Check the wiring, Check the pump’s power supply: if the pump is not working, replace it. Too much air: fully bleed the indoor module and the system for optimal operation. Incorrect wiring: check the electrical connections. Flow meter: Check the electrical connections and the direction of the flow meter (arrow pointing right). Replace the flow meter if necessary |
| H02.25 | ACI error | Titan Active System short-circuited or in an open circuit
Check the connecting cable. Check that the anode is not short-circuited or broken. |
| Code
error |
Message | Description |
| H02.36 | Funct device lost | Functional device disconnected
No communication between the central unit board and the additional circuit board Check the connection of the power cable between the electronic boards. Check the connection of the BUS cable between the electronic boards. Perform a self-detection. |
| H02.37 | Non-crit device lost | Non-critical device disconnected
No communication between the central unit board and the additional circuit board Check the connection of the power cable between the electronic boards. Check the connection of the BUS cable and the electronic boards. Perform a self-detection. |
| H02.60 | Not supportedé | The zone does not support the selected function |
| H06.01 | DéHP fault | The heat pump is in fault mode
Fault in the heat pump’s outdoor unit Check the wiring between the central unit board and the outdoor unit’s communication bus Check the connection of the communication cable between the central unit board and the interface board. Check the connection of the power cable between the central unit board and the interface board. Check the connection of the outdoor unit’s power cable. |
11.2.2 Fault codes
If a fault code persists after several automatic restart attempts, the heat pump switches to fault mode.
The heat pump will only resume normal operation once the installer has resolved the cause of the fault.
Following: a manual reset, or the reset of a maintenance message.
List of fault codes
| Code
déFault |
Message | Description |
| E00.00 | Open flow temp sensor | The flow temperature sensor is missing or a temperature below the
range is being measured |
| E00.01 | Flow temp sensor short-circuited
or temp > range |
The flow sensor is short-circuited or a temperature above the range is
being measured |
| Code
déFault |
Message | Description |
| E02.13 | Lockout input | Control unit lockout input from the appliance’s external environment
Input BL open. Check the wiring. Check the component connected to contact BL. Check the component connected to contacts AP001 and AP100. |
| E02.24 | Water flow error lockout | Lockout, the water flow is below the allowed limit. Insufficient flow: open a radiator valve
The circuit is clogged: Check that the filters are not blocked and clean them if necessary. Clean and flush the system. No circulation: Check that the valves and thermostatic valves are open. Check that the filters are not blocked. Check that the circulator pump is working properly. Check the wiring. Check the pump’s power supply: if the pump is not working, replace it. Too much air Fully bleed the indoor unit and the system for optimum operation. Check that the automatic air vents are open (also check on the hydraulic module). Fully bleed the indoor unit and the system for optimum operation. Faulty wiring: check the electrical connections. Flow meter: Check the electrical connections and the direction of the flow meter (arrow pointing right). Replace the flow meter if needed. |
Alert codes
An alert code corresponds to a temporary state of the heat pump following the detection of an anomaly. If an alert code persists after several automatic restart attempts, the system switches to fault mode.
List of alert codes
| Error code | Message | Description |
| A02.06 | Water Press Warning | Water pressure warning active |
| A02.18 | OBD Error | Object dictionary error |
| A02.22 | Low Flow Warning | Warning that the water flow is too low |
| A02.55 | Invalid Serial No. | Missing or invalid serial number |