W
EBASTO
S
CHOLASTIC
S
ERIES
7BASIC TROUBLESHOOTING
7-1
7. Basic Troubleshooting
7.1 General Information
This section describes troubleshooting procedures for the Scholastic Series coolant heater. Troubleshooting is
normally limited to the isolation of defective components.
CAUTION
Troubleshooting requires profound knowledge about structure and theory of operation of the heater. Troubleshooting
may only be performed by Webasto trained and certified, skilled personnel.
Before troubleshooting, check for and eliminate the following causes for problems:
- fuel supply (plugged fuel filter or pinched fuel line)
- corrosion of battery terminals
- corrosion of electrical wiring, connections and fuses
- loose contacts or wrong crimping on connectors
- shut-down initiated by temperature limiter (automatic reset)
- shut-down initiated by overheat fuse (replace fuse)
- shut-down initiated by inertia switch (manual reset)
Table 7-1: Quick Check Troubleshooting Matrix
7.2 Quick Check Troubleshooting Matrix
NOTE
After the correction of a problem or defect, a functional test of the heater as installed in the vehicle must be
performed.
