1. Tunnel furnace sudden power failure, to turn off the heating switch to prevent the call automatically start.

2. Check the tunnel furnace fan is running properly, with or without abnormal sound, if the machine immediately shut down and notify the maintenance workers overhaul.

3. Clean the tunnel surface and cavity dust, keep the machine clean and sanitary.

4. Check the tunnel furnace ammeter current is the same as normal, if any, notify the maintenance workers overhaul.