What if food is burnt on one side and undercooked on the other?

Please verify the following points and require itemized written supplier responses:（commercial oven oven-burnt-undercooked） This usually points to airflow, element distribution, tray placement or temperature-control problems, with frequent door opening and overcrowding adding to the issue. Adjust tray spacing, test each level and stop using the oven if fans or elements are faulty. 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.