carel mpxpro

[al]

having an annoying issue with a carel controller, fitted to a cold room with air on and off probes, no defrost probe. I'm trying to set room to control on 70% air on via parameter /4.

Room will only control on air off probe though, what am i missing?

[HVACRsaurus]

Is the inlet probe working?

Extract from manual,

* intake probe Sr error: MPXPRO starts control based on the outlet probe

[al]

Yes, i've checked each probe is reading, also it would bring up an error on controller.

[al]

Found the problem, i'd mistakenly set RD2, put this back to zero and virtual probe works!

[Grizzly]

its a wise man that can admit to his mistakes.

And in this case a very helpful one!

Thanks for the valuable info Al.

Grizzly

[al]

Thanks Grizz:D