Service Bulletin 4812 712 40348 - Whirlpool AWO/D 43115 Service Information

SERVICE

Service Bulletin 4812 712 40348

AUTHOR: Ronny Schuricht
Last Update: 05/16/11
VERSION: 1.0
TITLE: F23 appears, but pressure switch is ok.
SUBJECT: The customer claims the failure indication F23.
REMEDIAL ACTION
Pressure switch Failure
This failure code can be also generated by a defect heater or a defect drain pump or bad harness connections to heater or
drain pump.
To exclude the drain pump and the heater as root cause, please check:
1. Check if the drain pump is running and check for foreign objects in the filter (see F03)
2. Inverse the mains plug polarity (by turning the mains plug or by changing polarity of single connectors of the power cord
on the RFI Filter => ATTENTION: unplug appliance from mains before touching the single connectors!!!)
If with inversed polarity failure code remains F23, continue with checks for Pressure switch. If with inversed polarity failure
code changes to F12, check for Heater failure F12.
Pressure switch failure:
If the CCU can not properly read the OPEN or CLOSED status of the pressure switch contacts or if the CCU detects during
the wash cycle that the pressure switch contact for the wash level L1 (11-14) and the pressure switch contact for level
"empty drum L0"(11-12) are CLOSED or OPEN simultanously for 10 sec., this failure will be displayed.
Potential Causes
• Check the wiring connections between the pressure switch and the CCU (2 connectors on pressure switch and 2 connec-
tors on CCU)
• Check for proper operation of the pressure switch contacts (without water: 11-14 open, 11-12 closed, with water: 11-14
closed, 11-12 open).
Check the electrical resistance of the pressure switch for open and closed contacts without and with water.
• Start the Service program. If the problem persists the Error Code F23 will be displayed.
• If no issue found, check other points from hydraulic system like blocked air trap or blocked pressure switch hose (see
failure F01 and F03)
If these actions do not solve the issue and all parts like pressure switch and heating element are working correctly, then
exchange the control board by the new version indicated in the table below.
© Whirlpool EMEA
Whirlpool EMEA
Customer Services
8592 336 10008, 08/28/08
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