Error codes include a series of numbers and letters that are displayed on the screen and indicate the problem of the device. Error codes are programmed into many appliances, including washing machines. These error codes help the repairman to diagnose washing machine problems quickly. It also helps the user of the device to report faulty information when requesting better repairs to the repairman. In this app, the error code of 70 Iranian and foreign brands is provided along with the meaning and method of the error. Also, the method of using the mode test and reset of the washing machine is another part of the laundry app.