We have a Gene Cafe CBR-101 Coffee Bean Roaster, but after a few years of service, it died with an E4 error code.
These videos are best for describing how to disassemble: http://www.batchcoffee.com/pages/gene-cafe-coffee-roaster-repair-videos
Ran the tests in this document: http://cdn.shopify.com/s/files/1/0200/0574/files/Multimeter_Tests_Article.pdf?2005
The result was
- 120 volts on the heater lead pins
- infinite resistance between the heater element wire leads where it should have been 10 ohms
so order a replacement heater element.
And remove the existing heater element following the disassembly videos mentioned above: