read blogs on F1 code. took top off control panel and made sure electric plug connections were tight. pulled them off and reset them as suggested in a blog I read. worked fine. this has happened a few times over the past couple of years. resetting the connectors does the job. particularly the two on the left side. those are the ones that cause the code. the cause is opening and closing and possibly slamming the dryer door effects them after a while. sometimes I get the code and it goes away right away usually after slamming the door closed. I'm sure there are other causes for the code without a simple fix like this but this is one cause for the code