If your dryer only works intermittently and seems to heat up after being unplugged for a couple of days, there could be a few possible causes for this behavior. One likely explanation is a faulty thermal fuse or thermostat.
The thermal fuse is a safety device designed to prevent the dryer from overheating. If the temperature inside the dryer gets too high, the thermal fuse will blow, cutting off power to the heating element. This is a safety feature to prevent fires and other hazards. However, once the thermal fuse blows, the dryer won't heat until it's replaced.
Similarly, some dryers have multiple thermostats that regulate the temperature. If one of these thermostats malfunctions and prevents the heating element from turning on, the dryer will not produce heat until the faulty thermostat is fixed or replaced.
When you unplug the dryer for a couple of days, it gives the thermal fuse or thermostat time to cool down and potentially reset. As a result, when you plug it back in, the fuse might temporarily function again, allowing the dryer to heat up until the problem occurs again.
To diagnose and resolve the issue, it's best to have a qualified technician inspect the dryer. They can check the heating element, thermal fuse, thermostats, and other components to identify the exact cause of the problem. Additionally, make sure to follow proper safety precautions when dealing with electrical appliances, and do not attempt any repairs unless you have the necessary knowledge and experience.