Can I run a thermostatic fan without a heater?

[JRDM]

I have three heaters set up and in use on my 3HC. I also want to monitor and control/limit a heat break temperature to a set point. I'm using firmware 3.4.6.

I tried to set up IO output 2 as a heater but the firmware gives me a fault. I also tried to not assign it a heater and it didn't work.

I don't want an actual heater for this, I just turn on a fan if my heat break exceeds a set temperature.

With RRF 2 we used to have virtual heaters that allowed this kind of setup. Is there anything I can do? Right now I have it set up on my 6HC but I'd really love to see it on my 3HC for wiring simplicity but I seem to have run out of heater loops.

[dc42]

@JRDM yes you can do that, because in RRF3 a thermostatic fan is associated with a temperature sensor number, not a heater number.

[JRDM]

@dc42 OK thank you. I didn't pick up on that from the docs. I made the changes, removed my attempt at a dummy heater output. It works great now.