Microwave stops heating shortly after start and displays E02, or will not start heating at all but the turntable and light may work.

Safety warning: High-voltage components inside a microwave can be lethal. Do not attempt internal repairs unless you are qualified. Always unplug the unit before any inspection.

• Check ventilation: Ensure all vents on the sides, rear, and top of the Princess microwave are clear of obstructions and dust. Leave at least the manufacturer-recommended clearance around the unit.
• Allow cooling: If E02 appears after long cooking cycles, unplug the microwave for 30 minutes to allow the magnetron and thermal cut-outs to cool, then test again.
• Inspect for overloading: Avoid running the microwave empty or with very small loads, as this can overheat the magnetron.
• Service required: If E02 reappears quickly or the unit never heats, the magnetron, transformer, or thermal cut-out likely needs replacement. This should be done by a professional technician familiar with Princess microwave high-voltage systems.