There is a sheet for trouble shooting
the WFCO on their website. IMHO an upgrade to the Progressive is the best way to go. I have an 8955 and it will be getting upgraded soon. Even though the WFCO is working at the moment.
I had one crap out on another unit I used to own, after going through all the BS with WFCO I replaced with a PD unit and never looked back. I buy my converters and stuff from Best Converter
. Great people to deal with and will promptly answer and questions you may have.