Call Midwest tech
Call Bob at Midwest. (He is the service tech) He will walk you through the process or ask you a few questions. 574-532-9632
Ours did the same thing and they replaced it FAST!
If he asks you to call Tammy to get a replacement and the old one picked-up: Tammy: 1-800-772-7262
They did a great job and VERY FAST for me!