I a TROYER set of e-fans and the high temp fans runs all the time. It was 40 degrees this morning and it was running.I have switched relays and turned the Potentiometers and it will not turn off.It even runs with the key in acc.The fans have worked great for the last month or so. Any ideas? thanks

 

Sounds like a faulty controller for that hi-temp fan. Or a faulty probe - but since the probe is hardwired into the controller, the fix is the same.

If they are fairly new, call them for a warranty replacement.

This stuff happens.