www.webasto.us 25 Webasto Product N.A., Inc.
DBW 2010/2020/300 COOLANT HEATERS TROUBLESHOOTING
NOTE: If flame does not stop when the FUEL
SOLENOID VALVE button (7) is released, turn
MOTOR switch (5) OFF to stop heater. Check
and repair fuel solenoid valve accordingly.
F. Once the manual test run has been successfully
completed, set the heater switch or timer to OFF,
remove the tester and reconnect the control unit.
Once done, set the switch or timer to ON. If the
heater or a heater component does not respond, the
control unit is defective. Replace the control unit
and retest the heater.
NOTE: Since the heater operates in the 68 °C
(155 °F) to 75 °C (167 °F) On to Off / Off to On
range, and the vehicle engine may be hot [e.g.
coolant above 75 °C (167 °F)], the heater will
not start until the coolant temperature is below
68 °C (155 °F). THIS IS NORMAL and does not
indicate a problem.
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