Modbus entities unavailable at first configuration

I just set up modbus to my heatpump, and it seems like the integration itself is up. And I have created some sensor entities. But they are all unavailable. In the lo it looks like the connection is done ok, and I see no failures. It suggests that there is just nothing to read. Or am a reading the debug log correctly?

Configuration:

name: ctc
type: tcp
host: 192.168.1.248
port: 502
delay: 2

sensors:
  - name: "ctc_hot_water_temperature"
    unit_of_measurement: "°C"
    address: 62003
    scan_interval: 60
    #slave: 1
    #data_type: integer
    scale: 0.1
    input_type: holding

Debug log:

2024-11-13 22:55:41.925 DEBUG (MainThread) [pymodbus.logging] Connecting to 192.168.1.248:502.
2024-11-13 22:55:41.925 DEBUG (MainThread) [pymodbus.logging] Connecting comm
2024-11-13 22:55:41.929 DEBUG (MainThread) [pymodbus.logging] Connected to comm
2024-11-13 22:55:41.929 DEBUG (MainThread) [pymodbus.logging] Resetting frame - Current Frame in buffer - 
2024-11-13 22:55:41.933 DEBUG (MainThread) [pymodbus.logging] -> transport: received eof
2024-11-13 22:55:41.934 DEBUG (MainThread) [pymodbus.logging] Connection lost comm due to None
2024-11-13 22:55:41.934 DEBUG (MainThread) [pymodbus.logging] callback_disconnected called: None
2024-11-13 22:55:41.934 DEBUG (MainThread) [pymodbus.logging] Wait comm 100.0 ms before reconnecting.