21
Repair
Service Manual EF 473 / EF 474 enVersion 1.0
Replacing electronic control board
with button prints
Tools:
- Torx screwdriver T10
The service engineer must be
earthed using an earthing strap!
)
Only touch button prints with
dedicated gloves to avoid oxydation.
Procedure:
1. Follow general disassembly (see page 16).
2. Detach prints of buttons "small cup" (30)
and "large cup" (29) from upper chassis
(1).
3. Remove housing (28) from electronic
control board (28).
4. Unplug NTC connector and all wires from
electronic control board (28).
5. Unplug connector at flow meter (47).
6. Remove 2 screws (23) and replace
defective electronic control board with
button prints (29, 30).
7. Assemble in reverse sequence.
)
Check for correct wiring of electronic
control board (see pages 22, 23 or
24).
1
28
23
30
29
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