I have literally no idea what is going on here but essentially the fan is controlled by a controller in linear fashion based on the related loop temperature. The controller readout is correct (it doesn't increase to explain the rpm increase) but some reason my fans are spinning up without the temperature increasing.
Issue has only just started to happen over the past couple of days and I don't believe there's been any updates to the aquearo equipment.
Its worth noting but I assume its unrelated, I have had random issues with 1 of the 4 fan controllers stopping working every now and again (somewhere between a month and a week in-between issues); I haven't isolated which header is the issue, if it is a single one, so far but its definitely not Fan 1.
Any help at all would be greatly appreciated.