1. Firepower failure: the heating module of the rice cooker cannot heat normally, resulting in E2 error. This situation needs to be handled by contacting maintenance personnel.

2. The thermostat is damaged: the thermostat is an important part of the rice cooker. If it is damaged, it will lead to unstable temperature and E2 error. The thermostat needs to be replaced.

3. Program setting error: The user's improper operation, the set program does not match the actual situation, resulting in E2 error in the rice cooker. Need to reset the correct program.

For the E2 error, the user can solve it by the following methods:

1. To determine whether there is a power problem, you can try to change the power cord input to see if there is any change.

2. If there is something wrong with the thermostat, the corresponding parts need to be replaced.

3. If it is a program setting problem, you need to reset the correct program or restart the rice cooker.

In short, if you encounter an E2 error, we suggest that you check whether it is a power problem first. If not, we need to contact the maintenance personnel to solve the problem. At the same time, attention should be paid to the correct use of rice cookers to avoid operational errors such as setting wrong programs, so as not to cause failures.