Deleting Fault Code - Webasto Thermo Pro 90 Series Service Installations

5 Malfunctions and troubleshooting
5.3

Deleting fault code

5.3.1 Without Webasto Thermo Test PC
Diagnostics
Switching on the heater (via control element)
There is a fault and it is detected by the control unit as a
relevant malfunction
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 cause of fault (e.g. with or without fault code
output, visual inspection of fuses and plug connections, ...)
See Chapter "5.5 Fault code table (fault codes, flash
codes)" on page 503.
Switch off the heater
Rectify fault
Switch on the heater
Reset fault lock-out
5.3.2 with Webasto Thermo Test computer
diagnostics
Connect diagnostic cable to the heater diagnostic plug
(next to fuses).
Switch on the heater (via control element)
There is a fault and it is detected by the control unit as a
relevant malfunction
Heater shuts down due to the fault, i.e. fault switch-off
followed by fault lock-out.
502
Determine cause of fault by reading out the fault code
Click on the "Fault List" button to read out the fault code
Print out or note down fault code memory
Rectify fault
Clear fault code memory with the command "Clear Fault
Code Memory/Heater Lock-Out" in the "Fault Code
Memory" menu.
Switch on the heater
Reset fault lock-out
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 soft-
ware.
5.4 Heater lock-out
The heater can be unlocked:
Without Webasto Thermo Test computer diagnostics:
1. Switching on the heater (via control element)
2. Remove fuse F3 for at least 10 s within 10 s after swit-
ching on.
3. Reinsert fuse F3
4. Switching off the heater (via control element)
With Webasto Thermo Test computer diagnostics:
See Chapter "5.3.1 Without Webasto Thermo Test PC Diag-
nostics" on page 502.
Thermo Pro 90
memory.
memory.
NOTE