What if a gas noodle boiler will not ignite?

Please verify the following points and require itemized written supplier responses:（commercial noodle boiler noodle-boiler-gas-ignition） Possible causes include closed valves, low gas pressure, faulty igniters, flame failure devices or thermocouple problems. If gas odor is present, close the valve, ventilate and do not repeatedly ignite. 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.