Cause Of Malfunctions In The Heater And Systems; Instructions For Cancelling The Fault Lock-Out - Webasto Thermo Top Pro 120 Workshop Manual

6 | Malfunctions and troubleshooting
6.2.2 MultiControl / SmartControl / UniControl
Malfunctions are shown with fault codes in the display.
Error code output:
The fault code is indicated by a combination of digits and letters
(e.g. 'H02' or 'F05').
NOTE
Other fault codes (e.g. TXX) do not stem from the
heater and describe control element, system, or com-
munication faults.
6.3 Cause of malfunctions in the heater
and systems
A malfunction is caused when one or more faults occur. Pos-
sible faults are:
l Overvoltage / Undervoltage
l Malfunctions of components, e.g. due to short-circuit or
break
l The overheating of heater
l Impermissible exhaust temperature
l unsuccessful starts,
l flame failure.
6.4 Instructions for cancelling the fault
lock-out
6.4.1 Analogue cancelling the fault lock-out
Switching on the heater (via control element).
There is a fault and it is detected by the control unit as a relevant mal-
Heater shuts down due to the fault, i.e. fault switch-off followed by
fault lock-out. The fault code is shown on the control element.
Determine the cause of the fault
(e.g. with or without fault code output,
visual inspection of fuses and connectors, ...)
chapter 6.6, "Overview of faults and fault codes" on
See also
Switch off heater.
Rectify the fault.
Switch on the heater.
Fault lock-out unlocked.
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function.
page 17
.
6.4.2 Digital cancelling the fault lock-out (with
WTT)
Connect diagnostic cable to the heater diagnostic plug (next to fuses).
Switch on the heater.
There is a fault and it is detected by the control unit as a relevant mal-
Heater shuts down due to the fault, i.e. fault switch-off followed by
fault lock-out.
Determine error cause by reading out the fault code memory.
Click on the Fault list button to read out the fault code memory.
NOTE
Print out or note the fault code memory.
Rectify the fault.
Clear fault code memory with the command Clear fault code memory
or Heater lock-out in the Fault code memory menu.
Switch on the heater.
Fault lock-out unlocked.
NOTE
Certain faults add to the fault count in the fault code
memory. The heater assumes heater lock-out mode
when the number of faults in the fault code memory
exceeds a limit value. The maximum number of fault in
the fault code memory and the limit value of the fault
code memory is defined by the software.
9039412C Workshop manual TTP 120 _ 150
function.