No, it is not normal for the interior bottom/floor of a microwave to get excessively hot during regular use. While it is expected for the food or liquids being heated to get hot, the microwave's interior itself should not become dangerously hot.
If you notice that the interior bottom of your microwave is getting excessively hot, there could be several possible reasons for this issue:
Overheating components: The microwave's magnetron (the part that generates the microwaves) or other components may be malfunctioning, causing the microwave to generate more heat than it should.
Poor ventilation: A microwave requires proper ventilation to dissipate heat generated during operation. If the vents or cooling fan are blocked or not functioning correctly, it can lead to overheating.
Malfunctioning thermostat: Microwaves are equipped with thermostats to monitor and control the temperature. If the thermostat is faulty, it may not regulate the temperature properly.
Damaged door seal: A damaged door seal can lead to heat leakage, causing the microwave to get hotter than usual.
Internal insulation issues: If the insulation inside the microwave is damaged or deteriorated, it can lead to more heat being retained within the microwave's interior.
Excessive heat in a microwave can be a serious safety hazard, potentially leading to damage to the microwave itself or causing burns or fires. If you observe this issue, it is crucial to stop using the microwave immediately and have it inspected and repaired by a qualified technician.
Do not attempt to repair the microwave yourself, as microwaves contain high-voltage components that can be dangerous if mishandled. Always prioritize safety and have the appliance inspected by a professional to identify and rectify the problem properly.