Does a logicon failure sometimes cause intermittent problems? I am not always able to blend my cold/hot air, it somtimes blows cold air even in when in the hot position. There are no issues with my heating/coolant system.

Thanks in advance

 

sure, its common to have intermittent logicon problems like you have if one of the screws for the back of the controller/display has fallen into the logicon or if the slider has cold solder joints.

I rebuild those (BTW) at my webstore