Faultsheet, a checked reference for appliance error codes

Why it surfaced

This is a narrow reference site with an unusually explicit verification rule: each fact is checked against at least two independent sources and dated. It also refuses to turn poorly documented codes into confident advice, leaving them as table rows and reporting the gap instead.

Faultsheet explains appliance error codes, rates their seriousness, lists free checks to try first, and cites dated sources.