The problem of Nepal electric pressure cooker powering on and displaying E5 and unable to heat up can be caused by a variety of reasons. Here are some of the possible causes and repair methods:

Power failure: check whether the power connector is damaged or whether the power cord has a wiring problem. If so, the power connector or power cord needs to be replaced.

Heating failure: check whether the heater is damaged or whether the heating parts are aging. If there is a problem, the heater or heating parts need to be replaced.

Lid problem: Check for a poor seal or lid locking failure. These problems may result in the electric pressure cooker not working properly or the quality of the cooked rice decreases. In this case, you need to check the lid fitting for damage or replace the lid fitting.

If all the above checks are OK, then there may be a problem with the circuitry. For example, the IGBT on the power supply board may be damaged and need to be replaced with a new IGBT. In addition, the resistors R103 and R113 on the power supply board may be dropped or shorted, and need to be replaced with the corresponding resistors or the circuit repaired to make them accessible. If the power board transformer is damaged or capacitors C104 and C105 are abnormal, the corresponding parts also need to be replaced.

Please note that it is important to ensure safety when servicing an appliance, and it is best to disconnect the power and wait for the appliance to cool down before proceeding. Meanwhile, if you are not familiar with the maintenance of electrical appliances, it is recommended that you contact a professional maintenance personnel to carry out inspection and repair, so as to avoid causing greater damage or safety hazards.

In addition, in order to prevent such problems from occurring, it is recommended to regularly maintain and clean the electric pressure cooker to avoid damage to the appliance due to improper or excessive use.