Wittenborg FB 7100 - 3.2 Troubleshooting Non-Displayed Errors

Service Manual FB 7100 Event recording and troubleshooting
January, 2005 3- 11
3.2 Errors not shown in display
Introduction This section describes errors that are not indicated in the credit display and
Event log book, and suggestions for remedy.
Machine is out of
function
no display
No drinks
delivered
Water system
overflows
Note: It is important that the possible causes be checked in the order listed
in the table.
Open the machine, leave the power supply on and the water
tap open.
Remove cover for water system (see chap. 5A, page 5A-2)
and check for the following types of errors:
Possible cause Remedy
Power supply interrupted Check the power supply.
Main switch defective Check the main switch, replace if
necessary.
Power supply cable defective Check, replace if necessary.
See chap. 5K, page 5K-2
Plug contact fault Check contacts, replace if necessary.
Fuse defective Check the power supply, replace the
fuse if necessary.
See chap. 5K, page 5K-4
Possible cause Remedy
Harness or sensor for water level
control blocked by limescale build-up or
incorrectly mounted
Check, descale or replace if necessary.
See chap. 5A, page 5A-9
Water in hose between bottom of boiler
and overflow thermostat
Empty hose into waste bucket.
Possible cause Remedy
Inlet valve defective Check valve by removing one of the
terminals from the inlet valve.
• If the problem persists, replace the
inlet valve. See chap. 5A, page 5A-
12
• If the water stops running, the valve
is ok.
Harness or sensor for water level
control blocked by limescale build-up or
incorrectly mounted
Check, descale or replace if necessary.
See
chap. 5A, page 5A-9