Cannot connect to Fronius inverter

[dhover]

Describe the bug

I've had connected two inverters for many years. Recently I had to change the ip addresses of both inverters. Now one of them (Fronious) cannot connect anymore.

Expected behavior

Both inverters, e.g. Fronius and SolarEdge worked for many years without problems.

Screenshots

This is a screenshot of the inverter options

Diagnostic File

Not possible

Debug logs

2026-06-05 07:32:14.419 DEBUG (MainThread) [custom_components.solaredge_modbus_multi.hub] solaredge_modbus_multi configuration: inverter_list=[1], detect_meters=True, detect_batteries=False, detect_extras=False, keep_modbus_open=False, adv_storage_control=False, adv_site_limit_control=False, allow_battery_energy_reset=False, sleep_after_write=0, battery_rating_adjust=0, 
2026-06-05 07:32:14.419 DEBUG (MainThread) [custom_components.solaredge_modbus_multi.hub] pymodbus version 3.11.2
2026-06-05 07:32:14.425 DEBUG (MainThread) [custom_components.solaredge_modbus_multi] Retry limit=5 time=800 ratio=3
2026-06-05 07:32:14.425 DEBUG (MainThread) [custom_components.solaredge_modbus_multi.hub] New AsyncModbusTcpClient: reconnect_delay=0 reconnect_delay_max=3 timeout=3 retries=3
2026-06-05 07:32:14.425 DEBUG (MainThread) [custom_components.solaredge_modbus_multi.hub] Connecting to 192.168.30.101:1502 ...
2026-06-05 07:32:14.533 DEBUG (MainThread) [custom_components.solaredge_modbus_multi.hub] coordinator timeout is 21.6
2026-06-05 07:32:14.533 DEBUG (MainThread) [custom_components.solaredge_modbus_multi.hub] Looking for inverter at 192.168.30.101 ID 1
2026-06-05 07:32:14.533 DEBUG (MainThread) [custom_components.solaredge_modbus_multi.hub] I1: modbus_read_holding_registers address=40000 count=69
2026-06-05 07:32:26.537 ERROR (MainThread) [pymodbus.logging] No response received after 3 retries, continue with next request
>>>>> send: 0x0 0x1 0x0 0x0 0x0 0x6 0x1 0x3 0x9c 0x40 0x0 0x45
>>>>> Repeating....
>>>>> send: 0x0 0x1 0x0 0x0 0x0 0x6 0x1 0x3 0x9c 0x40 0x0 0x45
>>>>> send: 0x0 0x1 0x0 0x0 0x0 0x6 0x1 0x3 0x9c 0x40 0x0 0x45
2026-06-05 07:32:26.537 DEBUG (MainThread) [custom_components.solaredge_modbus_multi.hub] Disconnecting from 192.168.30.101:1502 (clear_client=False).
2026-06-05 07:32:26.537 DEBUG (MainThread) [custom_components.solaredge_modbus_multi] Finished fetching SolarEdge Coordinator data in 12.113 seconds (success: False)
2026-06-05 07:32:26.538 INFO (MainThread) [custom_components.solaredge_modbus_multi] Config entry 'Fronius' for solaredge_modbus_multi integration not ready yet: Setup failed: Modbus Error: [Input/Output] No response received after 3 retries, continue with next request; Retrying in 80 seconds
2026-06-05 07:32:26.538 DEBUG (MainThread) [custom_components.solaredge_modbus_multi] Full exception
Traceback (most recent call last):
  File "/config/custom_components/solaredge_modbus_multi/hub.py", line 400, in async_refresh_modbus_data
    await self._async_init_solaredge()
  File "/config/custom_components/solaredge_modbus_multi/hub.py", line 274, in _async_init_solaredge
    await new_inverter.init_device()
  File "/config/custom_components/solaredge_modbus_multi/hub.py", line 859, in init_device
    inverter_data = await self.hub.modbus_read_holding_registers(
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        unit=self.inverter_unit_id, address=40000, rcount=69
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/config/custom_components/solaredge_modbus_multi/hub.py", line 559, in modbus_read_holding_registers
    result = await self._client.read_holding_registers(
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        address=self._rr_address, count=self._rr_count, device_id=self._rr_unit
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/usr/local/lib/python3.14/site-packages/pymodbus/transaction/transaction.py", line 201, in execute
    raise ModbusIOException(txt)
pymodbus.exceptions.ModbusIOException: Modbus Error: [Input/Output] No response received after 3 retries, continue with next request
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "/config/custom_components/solaredge_modbus_multi/__init__.py", line 252, in _async_update_data
    return await self._refresh_modbus_data_with_retry(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ...<10 lines>...
    )
    ^
  File "/config/custom_components/solaredge_modbus_multi/__init__.py", line 296, in _refresh_modbus_data_with_retry
    raise ex
  File "/config/custom_components/solaredge_modbus_multi/__init__.py", line 293, in _refresh_modbus_data_with_retry
    return await self._hub.async_refresh_modbus_data()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/config/custom_components/solaredge_modbus_multi/hub.py", line 413, in async_refresh_modbus_data
    raise HubInitFailed(f"Setup failed: {e}")
custom_components.solaredge_modbus_multi.hub.HubInitFailed: Setup failed: Modbus Error: [Input/Output] No response received after 3 retries, continue with next request
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 433, in _async_refresh
    self.data = await self._async_update_data()
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/config/custom_components/solaredge_modbus_multi/__init__.py", line 266, in _async_update_data
    raise UpdateFailed(f"{e}")
homeassistant.helpers.update_coordinator.UpdateFailed: Setup failed: Modbus Error: [Input/Output] No response received after 3 retries, continue with next request
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/config_entries.py", line 787, in __async_setup_with_context
    result = await component.async_setup_entry(hass, self)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/config/custom_components/solaredge_modbus_multi/__init__.py", line 85, in async_setup_entry
    await coordinator.async_config_entry_first_refresh()
  File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 326, in async_config_entry_first_refresh
    await self._async_config_entry_first_refresh()
  File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 358, in _async_config_entry_first_refresh
    raise ex
homeassistant.exceptions.ConfigEntryNotReady: Setup failed: Modbus Error: [Input/Output] No response received after 3 retries, continue with next request
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/config/custom_components/solaredge_modbus_multi/__init__.py", line 266, in _async_update_data
    raise UpdateFailed(f"{e}")
homeassistant.helpers.update_coordinator.UpdateFailed: Setup failed: Modbus Error: [Input/Output] No response received after 3 retries, continue with next request
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/config_entries.py", line 787, in __async_setup_with_context
    result = await component.async_setup_entry(hass, self)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/config/custom_components/solaredge_modbus_multi/__init__.py", line 85, in async_setup_entry
    await coordinator.async_config_entry_first_refresh()
  File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 326, in async_config_entry_first_refresh
    await self._async_config_entry_first_refresh()
  File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 358, in _async_config_entry_first_refresh
    raise ex
homeassistant.exceptions.ConfigEntryNotReady: Setup failed: Modbus Error: [Input/Output] No response received after 3 retries, continue with next request

Home Assistant Version

2026.5.4

solaredge-modbus-multi Version

3.2.5

Installation Type

HAOS

Read the Instructions

• My configuration follows https://github.com/WillCodeForCats/solaredge-modbus-multi/wiki/Configuration
• I have read the Known Issues https://github.com/WillCodeForCats/solaredge-modbus-multi/wiki/Known-Issues
• This issue is not about a template error (do not report template errors, read https://github.com/WillCodeForCats/solaredge-modbus-multi/wiki/Template-Design-Notes)

Additional Context

No response

[WillCodeForCats]

The device isn't responding to modbus requests.

[dhover]

Ok, thanks for your answer. I'll see what I can do.

[dhover]

After a few days the Fronius could be added again without problems. It looks like the inverter denied the connection or so. Very strange.
So the problem is being solved.