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E91: Communication error between the display board and the main
E91
Incongruence between configuration values on starting the appliance
Checks to perform:
Check the wiring between the main circuit
board and the display board:
► Detach and reconnect the connectors
on both boards several times.
► Measure the continuity between
connector J10 (main PCB) and J13
(display board).
Is the wiring ok?
Replace the main circuit board and repeat
the diagnostic cycle to check for any
further alarms.
Is the appliance still displaying E91?
Replace the display board and repeat the
diagnostic cycle to check for any further
alarms.
If there are burns on the circuit
board, see page 65
2010 SOI/DT-mdm FCPD-dp Quality-tb
Guide to diagnostics for electronic controls EWM0931x
circuit board
Check that all the connectors are inserted correctly
Y
E
S
Y
E
S
Replace / repair the wiring and repeat the
diagnostic cycle to check for any further
NO
Appliance ok
NO
DISPLAY
CIRCUIT BOARD
58/67
alarms.
MAIN PCB
0Ω
599 72 97-24
E91
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