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BASIC TROUBLESHOOTINGWEBASTO DBW SERIES HEATERS
Malfunctions
The DBW Series of coolant heaters are designed with automatic, self-monitoring systems that will shut the heater off
in the event of a problem.
The heater will switch itself off automatically if combustion does not start after the heater has been switched on, or if
the flame goes out, or if the heater overheats. The operation indicator light will go out to signify a problem.
The following steps can be taken to determine and correct obvious problems.
If the operation indicator light does not come on at the same time as the heater is switched on, check and, if
necessary, replace fuse (F2). If the operation indicator light comes on when the heater is switched on, but goes out
after about 30 seconds, check and, if necessary, replace fuse (F3).
If overheating has occurred, locate and correct the problem. On the DBW 2010 Arctic, DBW 2020 and DBW 300
series heaters, it may be necessary to replace the overheat melt fuse located under the thermostat cover on top of
the heater. The fuse can be identified by the two white wires protruding from its top. The fuse is screwed hand tight
into a dry well plug. Do not over tighten the fuse when replacing. On all other DBW 2010 heaters not equipped with
an overheat fuse, simply correct the cause of overheating and allow the heater to cool down.
If a lock-out condition occurs due to a malfunction, this condition can be cleared and the control unit reset by
switching the heater off and switching it back on again. If the heater goes to lock-out once again after correcting all
obvious problems, consult your nearest Webasto Service Station.
NOTE:
In most heater models, the fuses referred to in the above paragraph can be located on the back wall of the heater
enclosure or are tray. Some models may also utilize a 30 amp. main fuse at the battery connection.
