Control and monitor your Östberg HERU energy recovery unit from Home Assistant through the onboard modbus interface.
Note: The integration requires HERU firmware version 1.09i or newer. Version 1.09i introduced one decimal to temperature sensors, and therefore needs to be scaled. The integration has been verified with HERU firmware version 1.14.
| Sensor | Modbus register |
|---|---|
| Boost input | 1x00002 |
| Current exhaust fan power | 3x00026 |
| Current exhaust fan step | 3x00024 |
| Current heating power | 3x00029 |
| Current heat/cold recovery power | 3x00030 |
| Current supply fan power | 3x00025 |
| Current supply fan step | 3x00023 |
| Exhaust air temperature | 3x00005 |
| Exhaust fan alarm | 1x00022 |
| Extract air temperature | 3x00004 |
| Filter days left | 3x00020 |
| Filter timer alarm | 1x00025 |
| Fire alarm | 1x00010 |
| Heat recovery temperature | 3x00007 |
| Last seen | Calculated |
| Night cooling active | 1x00038 |
| Outdoor temperature | 3x00002 |
| Overpressure input | 1x00003 |
| Recycle efficiency | Calculated |
| Rotor alarm | 1x00011 |
| Startup 1st phase | 1x00028 |
| Startup 2nd phase | 1x00029 |
| Supply air temperature | 3x00003 |
| Supply fan alarm | 1x00021 |
| Button | Modbus register |
|---|---|
| Clear Alarms | 0x00005 |
| Reset filter timer | 0x00006 |
| Sync date and time | 4x00400 - 4x00405 |
| Switch | Modbus register |
|---|---|
| Away mode | 0x00004 |
| Boost mode | 0x00003 |
| Heater enabled | 4x00067 |
| Night cooling enabled | 4x00019 |
| Overpressure mode | 0x00002 |
| Power | 0x00001 |
| Preheater enabled | 4x00064 |
| Number | Modbus register |
|---|---|
| Night cooling exhaust high limit | 4x00021 |
| Night cooling exhaust low limit | 4x00022 |
| Night cooling indoor-outdoor diff. limit | 4x00020 |
- In Home Assistant go to HACS -> Integrations. Click on "+ Explore & Download Repositories" and search for "HERU".
- In Home Assistant go to Settings -> Devices & Services -> Integrations. Click on "+ Add integration" and search for "HERU".
Enable modbus and network on the HERU unit in the service menu using 1991 as pin code.