Heater Unlocking Instructions; Overview Of Faults And Fault Codes - Webasto Thermo Top Pro 120 Workshop Manual

6.5

Heater unlocking instructions

The heater can be unlocked with or without Webasto Thermo
Test PC diagnostics.
6.5.1 Analogue heater unlocking
NOTE
When on-board power supply is applied, never discon-
nect the connector from the heater.
The fault must be rectified.
To do so, follow these steps:
u
Switching on the heater (via control element).
u
Remove fuse for at least 2 s within 2 s after switching on
(e.g. F3 on-board power supply of the vehicle).
u
Reinsert the fuse.
u
Switching off the heater (via control element).
6.5.2 Heater unlocking, digital (with WTT)
See chapter 6.4.2, "Digital cancelling the fault lock-out (with
WTT)" on page 16.
9039412C Workshop manual TTP 120 _ 150
6.6

Overview of faults and fault codes

NOTE
The control element can be connected via W-bus or
analogue (see wiring diagrams):
-W-bus connection: the HXX fault codes are shown in
the display.
- Analogue connection with display: the FXX fault codes
are shown in the display.
Analogue connection without display: the fault codes
are shown by the number of long flash pulses after the
5 short flash pulses.
NOTE
Hexadecimal fault codes
The letter "H" is shown on the control element before
the code, and in the WTT Diagnostics, the "h" is shown
at the end of the code. This means that, for example,
"H01" is equivalent to "01h".
NOTE
The heater can lock if several faults are registered. To
unlock the heater, see chapter chapter 6.5, "Heater un-
locking instructions" on page 17.
All heater components are queried by the control unit.
The corresponding component must be checked first
when there is a defect. If it is OK, it must be assumed
that the control unit is defective.
NOTE
Replace component:
Within the warranty period, send in only the defective
component (not the entire heater) to Webasto.
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