20 Most Recent Patton MH761 Utility Heater - Page 2 Questions & Answers

I doubt that they have any Teflon in them, and it would certainly have burned off by now if it did.

You need to include more information: Model number would be helpful. You could also try checking your product manual and seeing if they list a way to unlock the phone.

The thermostat is probably shot. These units are repairable but disposable, meaning the repair will likely cost as much as a new unit.