Technical data

DBW 2010 / 2012 / 2020 / 2022 / 300 / 350 5.Error Search and Error Elimination
501
5 Error Search and Error Elimination
5.1 General
The error search and error elimination in the DBW
2010/2012/2020/2022/300/350 heating devices will be
defined in this section.
ATTENTION
The error search and error elimination requires
knowledge on the structure and work of each component
of the heating device and can only be carried out by
trained personnel.
The functional relationships can be seen in Section 2 or 3
in case of uncertainty.
ATTENTION
The sensing of the error is under normal conditions
limited with specifying the defective element.
The following reasons of defect have not been taken into
consideration and must as a matter of principle be
checked or no chance should be given to the occurrence
of defects due to such reasons.
Corrosion in the socket
Contact failure in the contact of the socket
Failure of the cable shoe in the socket
Corrosion in the cables and fuses
Corrosion in the battery poles
A function test must be conducted on the vehicle after
each error elimination.
5.2 The General Error Indications
The likely general error indications have been listed in the
table below (Figure 501)
Error Indication Likely Reason
Error in the electrical system
Control lamp does not light and the heating device does
not work
• No feeding voltage
• Fuses
• The feeding line in the socket contacts of the A
socket of the control device
F2 fuse disconnected Short circuit in the circulation pump or in the line to the
heating device
F3 fuse disconnected Short circuit in the line to the heating device / engine /
pre-heating element of the nozzle block (if any)
.
The heating devices works normally but the work indicator
lamp is not lighted
The work indicator lamp is defective or there is an
interruption or short circuit in its cables
Error in the water system
The heating device will be shut off because the attached
heat exchanger cannot provide sufficient heat
Flow amount is very low because
• there is air or gas in the heating device, heat
exchangers or system sections
• the valves are partially closed (flow adjustment), dirty
or closed
• there is dirt in the system, for instance in the filter or
bottlenecks
• the circulation pump pumps insufficient amounts
(there is air or gas in the pump body)
• the rotation direction is opposite – check the cable
colors (black + / brown -)
• insufficient anti-freeze
Figure 501 General Error Indications (Page 1 / 2)