List of error codes for the De Dietrich Alezio AWHP-V200 air-to-water heat pump
List of error codes for the air-to-water heat pump – De Dietrich ALEZIO AWHP-V200
- MIV-4/E 4–8 V200
- MIV-4/E 11–16 V200
- MIV-4/H 4–8 V200
- MIV-4/H 11–16 V200
Download the manual for the De Dietrich Alezio AWHP V220
| Note
The indication RESET appears when a fault code is detected. Once the problem has been resolved, pressing the button resets the unit’s functions and clears the fault. If there are multiple faults, they are displayed one after another.
11.2.1 Error codes for the EHC-02 electronic control board
An A.xx.xx or H.xx.xx error code corresponds to a temporary state of the hybrid pump following detection of a fault. If an error code persists after several automatic restart attempts, the hybrid system switches to fault mode. Fault mode is indicated by an Exx-type fault code. The hybrid heat pump will not resume operation until the fault has been cleared. Note Only the error codes generated by the hybrid system are described here. For error codes generated by the boiler, refer to the boiler’s installation and maintenance manual
|
| Code error | Message | Description |
| A.02.06 | WATER PRESSURE ALERT | Water pressure in the system is below the minimum pressure |
| A.02.22 | FLOW SYSTEM ALERT | Flow in the system is below the minimum flow |
| Code | Message | Description | Check |
| H. 00.00 | T FLOW OPEN | Hybrid system flow sensor fault | Poor connection
Check the wiring between the EHC-02 electronic control board and the hybrid heat pump temperature sensor (I3) Check that the sensor was fitted correctly Sensor failure Check the sensor’s ohmic value Replace the sensor if necessary |
| H. 00.01 | T FLOW CLOSED | Hybrid system flow sensor fault | Poor connection
Check the wiring between the EHC-02 electronic control board and the hybrid heat pump temperature sensor (I3) Check that the sensor was fitted correctly Sensor failure Check the sensor’s ohmic value Replace the sensor if necessary |
| H. 00.16 | T DHW OPEN | Low DHW temperature sensor fault | Poor connection
Check the wiring between the EHC-02 electronic control board and the tank’s low DHW temperature sensor Check that the sensor was fitted correctly Sensor failure Check the sensor’s ohmic value |
| H. 00.17 | T DHW CLOSED | Low DHW temperature sensor fault | Poor connection
Check the wiring between the EHC-02 electronic control board and the tank’s low DHW temperature sensor Check that the sensor was fitted correctly Sensor failure Check the sensor’s ohmic value Replace the sensor if necessary |
| H. 00.32 | T OUTDOOR OPEN | Outdoor temperature sensor fault | Poor connection
Check the wiring between the EHC-02 electronic control board and the outdoor temperature sensor Check that the sensor was fitted correctly Sensor failure Check the sensor’s ohmic value Replace the sensor if necessary |
| Code | Message | Description | Check |
| H. 00.33 | T OUTDOOR CLOSED | Outdoor temperature sensor fault | Poor connection
Check the wiring between the EHC-02 electronic control board and the outdoor temperature sensor Check that the sensor was fitted correctly Sensor failure Check the sensor’s ohmic value Replace the sensor if necessary |
| H. 00.40 | S WATER PRESSURE OPEN | The water pressure sensor is faulty | Check that the connecting cable between the electronic control board and the water pressure sensor is not short-circuited or open
Check that the water pressure sensor is not short-circuited or faulty |
| H. 00.41 | S WATER PRESSURE CLOSED | The water pressure sensor is faulty | Check that the connecting cable between the electronic control board and the water pressure sensor is not short-circuited or open
Check that the water pressure sensor is not short-circuited or faulty |
| H. 00.47 | T HP FLOW OPEN | Heat pump flow temperature sensor fault | Poor connection
Check the wiring between the EHC-02 electronic control board and the heat pump flow temperature sensor (I1) Check that the sensor was fitted correctly Sensor failure Check the sensor’s ohmic value Replace the sensor if necessary |
| H. 00.48 | T HP FLOW CLOSED | Heat pump flow temperature sensor fault | Poor connection
Check the wiring between the EHC-02 electronic control board and the heat pump flow temperature sensor (I1) Check that the sensor was fitted correctly Sensor failure Check the sensor’s ohmic value Replace the sensor if necessary |
| H. 00.51 | T HP RETURN OPEN | Heat pump return temperature sensor fault | Poor connection
Check the wiring between the EHC-02 electronic control board and the heat pump return temperature sensor (I2) Check that the sensor was fitted correctly Sensor failure Check the sensor’s ohmic value Replace the sensor if necessary |
| H. 00.52 | T HP RETURN CLOSED | Heat pump return temperature sensor fault | Poor connection
Check the wiring between the EHC-02 electronic control board and the heat pump return temperature sensor (I2) Check that the sensor was fitted correctly Sensor failure Check the sensor’s ohmic value Replace the sensor if necessary |
| H. 00.57 | S DHW TOP OPEN | High DHW temperature sensor fault | Poor connection
Check the wiring between the EHC-02 electronic control board and the tank’s high DHW temperature sensor Check that the sensor was fitted correctly Sensor failure Check the sensor’s ohmic value Replace the sensor if necessary |
| H. 00.58 | S DHW TOP CLOSED | High DHW temperature sensor fault | Poor connection
Check the wiring between the EHC-02 electronic control board and the tank’s high DHW temperature sensor Check that the sensor was fitted correctly Sensor failure Check the sensor’s ohmic value Replace the sensor if necessary |
| H. 02.00 | RESET IN PROGRESS | Reset in progress |
| Code | Message | Description | Check |
| H. 02.02 | WAITING FOR CONFIG NUMBER | The heat pump is not configured | The EHC-02 electronic control board has been replaced
Set the outdoor unit type (CONF parameter) Check that the settings are correct |
| H. 02.03 | CONFIG ERROR | The heat pump is not configured | The EHC-02 electronic control board has been replaced
Set the outdoor unit type (CONF parameter) Check that the settings are correct |
| H. 02.04 | PARAMETER ERROR | Incorrect parameter configuration | The EHC-02 electronic control board has been replaced.
Set the outdoor unit type (CONF parameter) Check that the settings are correct |
| H. 02.05 | PSU | Internal error | Software change (software number or parameter version inconsistent with memory) |
| H. 02.07 | WATER PRESSURE ERROR | Insufficient water pressure | Check that the connecting cable between the EHC-02 electronic control board and the water pressure sensor is not short-circuited
Check that the water pressure sensor is not short-circuited or faulty Check that the water pressure in the heating circuit is sufficient |
| H. 02.09 | PARTIAL LOCKOUT | The BL input on the EHC-02 electronic control board’s terminal strip is open | The contact connected to the BL input is open Check the contact on the BL input
Parameter error Check the AP001 and AP100 parameters Poor connection Check the wiring |
| H. 02.10 | TOTAL LOCKOUT | The BL input on the EHC-02 electronic control board’s terminal strip is open | The contact connected to the BL input is open Check the contact on the AP001 and AP100 input
Parameter error Check the BL parameter Poor connection Check the wiring |
| H. 02.23 | FLOW SYSTEM ERROR | Insufficient flow | No circulation
Check the operation of the circulator pump Check that the valves and thermostatic valves are open 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 optimum 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 The circuit is clogged Check that the filters are not blocked Clean and flush the system |
| H. 02.36 | FUNCTIONAL DEVICE DISCONNECTED | No communication with the electronic control board
SCB-04 |
Check that the power cable between the EHC-02 and SCB-04 electronic control boards is connected
Check that the bus cable between the EHC-02 and SCB-04 electronic control boards is connected Perform a self-detection |
| H. 02.37 | NON-CRITICAL DEVICE DISCONNECTED | No communication with the electronic control board
SCB-04 |
Check that the power cable between the EHC-02 and SCB-04 electronic control boards is connected
Check that the bus cable between the EHC-02 and SCB-04 electronic control boards is connected Perform a self-detection |
| Code | Message | Description | Verification |
| H. 06.01 | HEAT PUMP FAULT | Outdoor unit fault on the heat pump | Check that the cable connecting the EHC-02 circuit board to the outdoor unit’s communication bus is connected
Check that the communication cable between the EHC-02 circuit board and the FTC circuit board is properly connected Check that the power cable between the EHC-02 circuit board and the FTC circuit board is properly connected Check that the outdoor unit is properly powered Fault on the outdoor unit (refer to the error codes specific to the outdoor unit) |
| Code | Message | Description | Verification |
| E. 02.13 | BLOCKING INPUT | Lockout via the BL input | Poor connection Check the wiring
External cause Check the component connected to the AP001 and AP100 contact Parameter incorrectly set Check the AP001 and AP100 parameter |
| E. 02.24 | SYSTEM FLOW BLOCKING | Heating water flow too low | No circulation
Check the operation of the circulator pump Check that the valves and thermostatic valves are open 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 Check that the automatic air vents are open (also check on the hydraulic module) 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 The circuit is clogged Check that the filters are not clogged Clean and flush the system |
Note
Once the issue related to an E.xx.xx type code has been resolved, you must press the RESET button on the display to restart the hybrid heat pump.
11.2.2 Error codes for the second circuit’s circuit board (SCB-04 board)
An error code corresponds to a temporary state of the heat pump following the detection of an issue.
The control panel attempts to automatically restart the heat pump until it powers on.
| Error code | Message | Description | Verification |
| H. 00.00 | OPEN FLOW TEMP | Heat pump flow sensor fault | Poor sensor connection
Check the wiring between the EHC-02 circuit board and the sensor Check that the sensor was installed correctly Sensor failure Check the sensor’s resistance value Replace the sensor if necessary |
| H. 00.01 | CLOSED FLOW TEMP | Missing domestic hot water sensor | Poor connection
Check the wiring between the EHC-02 circuit board and the sensor Check that the sensor was installed correctly Sensor failure Check the sensor’s resistance value Replace the sensor if necessary |
| H. 00.16 | OPEN DHW TEMP | Missing domestic hot water sensor | Poor connection
Check the wiring between the EHC-02 circuit board and the sensor Check that the sensor was installed correctly Sensor failure Check the sensor’s resistance value Replace the sensor if necessary |
| H. 00.17 | CLOSED DHW TEMP | Short circuit on the domestic hot water sensor | Poor connection
Check the wiring between the EHC-02 circuit board and the sensor Check that the sensor was installed correctly Sensor failure Check the sensor’s resistance value Replace the sensor if necessary |
| H. 00.32 | OPEN OUTDOOR TEMP | Missing outdoor sensor | Poor connection
Check the wiring between the EHC-02 circuit board and the sensor Check that the sensor was installed correctly Sensor failure Check the sensor’s resistance value Replace the sensor if necessary |
| H. 00.33 | CLOSED OUTDOOR TEMP | Missing or faulty outdoor sensor | Poor connection
Check the wiring between the EHC-02 circuit board and the outdoor sensor Check that the outdoor sensor was installed correctly Sensor failure Check the sensor’s resistance value Replace the sensor if necessary |
| H. 02.00 | RESET IN PROGRESS | Reset in progress | |
| H. 02.02 | WAITING FOR CONFIG NUMBER | The heat pump is not configured | Set the outdoor unit type (CONF parameter).
Check that the parameter is set correctly. |
| H. 02.03 | CONFIG ERROR | The heat pump is not configured | Set the outdoor unit type (CONF parameter).
Check that the parameter is set correctly. |
| H. 02.04 | PARAMETER ERROR | Incorrect configuration of the circuit board’s parameters | Incorrect configuration of the circuit board’s parameters |
| H. 02.05 | PSU | Memory error | Program change (program number or version parameter inconsistent with memory) |
| Error code | Message | Description | Verification |
| H. 02.40 | FUNCTION UNAVAILABLE | Function not available in the control system | Incorrect parameter setting |
Control sequence
| State and description | Sub-state and description |
| 00: Off | 00: Off: Complete system shutdown |
| 01: Heating / cooling / domestic hot water request | 00: Off: Setpoint temperature reached. The compressor can start as soon as needed.
01: Anti-short cycle: The heating setpoint has been reached. The compressor is not allowed to restart. 02: Switching the reversing valve to heating position. 03: Power supply to the hybrid pump 04: Waiting for start conditions of the heat pump and backup heaters. 62: Switching the 3-way valve to domestic hot water position. |
| State and description | Sub-state and description |
| 03: Heating mode operation | 30: Normal operation: the compressor or the backup heaters are running.
31: Internal setpoint limited: If the heat pump’s heating setpoint differs from the system setpoint. 60: Pump post-operation: Heat pump and backup heaters off, system pump running. 65: Compressor load shedding. The backup heaters are running. 66: The temperature is above the compressor’s maximum operating temperature. The compressor is off. The backup heaters are running. 67: The outdoor temperature is below the compressor’s operating temperature. The compressor is off. The backup heaters are running. 68: The hybrid function is requesting the compressor to stop. The compressor is off. The backup heaters are running. 69: Defrosting in progress. The compressor is running. 70: Defrosting in progress. The compressor is off. The backup heaters are running. 71: Defrosting in progress. The compressor and backup heaters are running. |
| 04: Domestic hot water mode operation | 30: Normal operation. The compressor or the backup heaters are running.
31: Internal setpoint limited: If the heat pump’s heating setpoint differs from the system setpoint. 60: Pump post-operation: Heat pump and backup heaters off, system pump running. 65: Compressor load shedding. The backup heaters are running. 66: The temperature is above the compressor’s maximum operating temperature. The compressor is off. The backup heaters are running. 67: The outdoor temperature is below the compressor’s operating temperature. The compressor is off. The backup heaters are running. 68: The hybrid function is requesting the compressor to stop. The compressor is off. The backup heaters are running. 69: Defrosting in progress. The compressor is running. 70: Defrosting in progress. The compressor is off. The backup heaters are running. 71: Defrosting in progress. The compressor and backup heaters are running. |
| 06: Pump post-operation | 60: Pump post-operation. Heat pump and backup heater off, system pump post-operation running. |
| 07: Cooling mode operation | 30: Normal operation. Cooling is active.
75: Compressor shutdown due to the condensation sensor. 78: Setpoint temperature correction. Cooling setpoint increased due to the condensation sensor. 82: Temperature below the minimum cooling temperature. Compressor shutdown. |
| 08: Controlled compressor shutdown | 00: Off: the heating or cooling setpoint has been reached.
01: Anti-short cycle. The heating setpoint has been reached. The compressor is not allowed to restart. 60: Pump post-operation. Heat pump and backup heater off, system pump post-operation running. 67: The outdoor temperature is below the compressor’s outdoor operating temperature. The compressor is off. The backup heaters are running. 68: The hybrid function is requesting the compressor to stop. The compressor is off. The backup heaters are running. 75: Compressor shutdown due to the condensation sensor. 76: Compressor shutdown due to flow 79: Compressor and backup heater load shedding in heating / domestic hot water mode. 80: Compressor and backup heater load shedding in cooling mode. 82: Temperature below the minimum cooling temperature. Compressor shutdown. |
| 09: Lockout | XX: Fault code |
| 10: Lockout | 00: Off / lockout |
| 11: Forced operation in cooling mode | 30: Normal operation |
| State and description | Sub-state and description |
| 12: Forced operation in heating mode | 30: Normal operation. The compressor or the backup heaters are running.
31: Internal setpoint limited: If the heat pump’s heating setpoint differs from the system setpoint. 60: Pump post-operation. Heat pump and backup heater off, system pump post-operation running. 65: Compressor and backup heater load shedding running. 66: The temperature is above the compressor’s maximum operating temperature. The compressor is off. The backup heaters are running. 67: The outdoor temperature is below the compressor’s outdoor operating temperature. The compressor is off. The backup heaters are running. 68: The hybrid function is requesting the compressor to stop. The compressor is off. The backup heaters are running. 69: Defrosting in progress. The compressor is running. 70: Defrosting in progress. The compressor is off. The backup heaters are running. 71: Defrosting in progress. The compressor and backup heaters are running. |
| 16: Frost protection | 30: Normal operation. The compressor or the backup heaters are running.
31: Internal setpoint limited: If the heat pump’s heating setpoint differs from the system setpoint. 60: Pump post-operation. Heat pump and backup heater off, system pump post-operation running. 65: Compressor and backup heater load shedding running. 66: The temperature is above the compressor’s maximum operating temperature. The compressor is off. The backup heaters are running. 67: The outdoor temperature is below the compressor’s outdoor operating temperature. The compressor is off. The backup heaters are running. 68: The hybrid function is requesting the compressor to stop. The compressor is off. The backup heaters are running. 69: Defrosting in progress. The compressor is running. 70: Defrosting in progress. The compressor is off. The backup heaters are running. 71: Defrosting in progress. The compressor and backup heaters are running. |
| 17: Bleeding | 30: Normal operation. The compressor or the backup heaters are running.
31: Internal setpoint limited: If the heat pump’s heating setpoint differs from the system setpoint. 60: Pump post-operation. Heat pump and backup heater off. 65: Compressor and backup heater load shedding running. 66: The temperature is above the compressor’s maximum operating temperature. The compressor is off. The backup heaters are running. 67: The outdoor temperature is below the compressor’s outdoor operating temperature. The compressor is off. The backup heaters are running. 68: The hybrid function is requesting the compressor to stop. The compressor is off. The backup heaters are running. 69: Defrosting in progress. The compressor is running. 70: Defrosting in progress. The compressor is off. The backup heaters are running. 71: Defrosting in progress. The compressor and backup heaters are running. |