The only thing I can see would be the switch. A quick test with a meter
could verify it. Now the other way around when it would not work on auto,
would be more complex as it would include the thermostat or timer whichever
was in the auto circuit.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.