If your washing machine only works when you open the touch panel and expose it to sunlight, it suggests that there may be an issue with the touch panel itself or its connection. Here are a few possible explanations:
Moisture or condensation: The bathroom environment is generally more humid, which can cause moisture to accumulate inside the touch panel or its connectors. Over time, this moisture can affect the proper functioning of the panel. Exposing the panel to sunlight may help evaporate the moisture temporarily, allowing it to work for a short period.
Loose or corroded connections: The heat from sunlight might cause the components or connectors in the touch panel to expand slightly, making better contact and temporarily restoring functionality. However, when the panel cools down again, the connections may become loose or develop corrosion, leading to the washing machine not turning on.
Heat-related issue: It's possible that the touch panel or its internal components are sensitive to temperature changes. Sunlight may provide enough heat to raise the temperature of the panel, temporarily resolving the issue. However, once the panel cools down again, the problem may reoccur.
In this situation, it's recommended to contact the manufacturer or a professional technician for assistance. They will be able to diagnose the specific problem with your washing machine and provide a solution. It's possible that the touch panel may need to be repaired or replaced to resolve the issue permanently.