I suppose you are talking about gas water heater.

来源: 于 2021-09-04 20:08:10 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

Rheem AM40277-1 Water Heater Burner Assembly

you can shut off the gas valve, remove the burner assembly, clean up water in the burner and pilot devices and put back. 

there is no sophiscated electronics.