Zehnder ComfoFan Silent - P always reports LOW speed

[paulsijben]

I have connected the setup with my ComfoFan Silent - P. (the perilex version)
However, even at maximum the speed percentage is 61. See below.

Is this a weirdness in my fan setup or is this a software thing?

high
{"result":"ok","devices":{"FD":{"type": "fan","id": "FD","voltage": 6.1,"percentage": 61,"speed": "low","timer": false}},"rxdata":["03D201FDFA0704013D000B0000000000","03D201FDD10704013D000B0000000000","03D201FDBD0704013D000B0000000000","03D201FDAC0704013D000B0000000000","03D201FD9F0704013D000B0000000000","03D201FD900704013D000B0000000000","03D201FD830704013D000B0000000000","03D201FD6F0704013D000B0000000000","03D201FD5E0704013D000B0000000000","03D201FD4A0704013D000B0000000000","03D201FD2F0704013D000B0000000000","03D201FD130704013D000B0000000000"]}

medium
{"result":"ok","devices":{"FD":{"type": "fan","id": "FD","voltage": 4.0,"percentage": 40,"speed": "low","timer": false}},"rxdata":["03D201FDFA07040128000B0000000000","03D201FDD907040128000B0000000000","03D201FDC007040128000B0000000000","03D201FDAC07040128000B0000000000","03D201FD9E07040128000B0000000000","03D201FD8607040128000B0000000000","03D201FD7007040128000B0000000000","03D201FD5607040128000B0000000000","03D201FD4707040128000B0000000000","03D201FD3207040128000B0000000000","03D201FD1F07040128000B0000000000"]}

low:
{"result":"ok","devices":{"FD":{"type": "fan","id": "FD","voltage": 3.0,"percentage": 30,"speed": "low","timer": false}},"rxdata":["03D201FDFA0704011E000B0000000000","03D201FDE70704011E000B0000000000","03D201FDD70704011E000B0000000000","03D201FDC50704011E000B0000000000","03D201FDB40704011E000B0000000000","03D201FD9F0704011E000B0000000000","03D201FD920704011E000B0000000000","03D201FD7F0704011E000B0000000000","03D201FD6E0704011E000B0000000000","03D201FD5B0704011E000B0000000000","03D201FD440704011E000B0000000000","03D201FD2F0704011E000B0000000000","03D201FD150704011E000B0000000000"]}

note: I must have a poor nrf board as I need to have it really close to the fan