WEBASTO DBW SERIES HEATERS BASIC TROUBLESHOOTING
Basic Troubleshooting
General Information
This section describes troubleshooting procedures for DBW Series coolant heaters. Troubleshooting is normally
limited to the isolation of defective components.
CAUTION
Troubleshooting requires profound knowledge about structure and theory of operation of the heater and components.
Troubleshooting and fault correction should only be performed by Webasto trained, skilled personnel unless
otherwise stated in this manual.
Before troubleshooting, check for and eliminate the following defects:
• fuel supply (plugged fuel filter, kinked fuel line)
• corrosion on battery terminals
• blown fuses
• corrosion on electrical wiring, connections and fuses
• loose contacts or improper crimping on connectors
• shut down initiated by temperature limiter thermostat (automatic reset)
• shut down initiated by overheat fuse
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