Error codes and messages

Databases

 * MariaDB error codes‎
 * MySQL error codes‎
 * Oracle database error messages
 * SQLite result codes

Network protocols

 * HTTP status codes

Operating system

 * HRESULT
 * Windows System Error Code

Other software

 * Microsoft Exchange Server error codes

Devices

 * HP device error codes
 * Lexmark error codes
 * PS3 error codes
 * Xbox error status codes

Appliances

 * Admiral stove fault codes
 * Bosch stove fault codes
 * Dacor stove fault codes
 * Estate stove fault codes
 * Frigidaire stove fault codes
 * GE stove fault codes
 * GE microwave fault codes
 * Gibson stove fault codes
 * Hotpoint stove fault codes
 * Jenn-Air stove fault codes
 * Kelvinator stove fault codes
 * Kitchen Aid stove fault codes
 * Kitchen Aid built-in microwave oven fault codes
 * Kitchen Aid Cooktop fault codes
 * Kitchen Aid front loading automatic washer fault codes
 * Kitchen Aid front loading gas and electric dryer fault codes
 * Magic Chef stove fault codes
 * Maytag stove fault codes
 * Roper Range stove fault codes
 * Tappan stove fault codes
 * Thermador stove fault codes
 * Whirlpool stove fault codes
 * Whirlpool Duet front loading automatic washer fault codes
 * Whirlpool Duet front loading gas and electric dryer fault codes
 * Whirlpool Calypso automatic washer fault codes

Computers on a vehicle

 * Chrysler, Dodge, and Jeep Computer error codes