Why does rice in a commercial rice cooker come out undercooked or burnt?

Please verify the following points and require itemized written supplier responses:（commercial rice cooker rice-cooker-faults） Undercooked rice may result from insufficient water, overloading, poor lid sealing or opening during cooking; burning may come from a deformed liner, faulty temperature control or long holding. Check rice-water ratio, liner contact, temperature control, liner base and heating plate. Define capacity, accuracy, materials and operating environment before requesting quotes on a uniform basis. Request specification sheets, test reports, certificates, maintenance manuals and spare-part lists. During acceptance, verify appearance, dimensions, functions, safety protection and packaging, and keep test records. Do not compare unit price alone; include customization, freight, spare parts, after-sales support and downtime risk. Keep written records of inquiries, confirmations, FAT, acceptance and warranty commitments.