Maytag LAT2300 Service Manual page 135

CAUTION - - - - - - - - - - - - - - - - - - - - - - - - - ,
Always disconnect power supply before making any continuity checks or resist-
ance readings. Always use caution when doing voltage tests.
Microprocessor Board Fault Codes
• F1 in display indicates Board Failure (lid circuit). Inoperable. Replace micro-
processor board.
• F2 in display indicates Water valve thermistor sense failure (too low). Operative.
• F2 in display indicates Water valve thermistor sense failure (too high). Operative.
• F4 in display indicates Board Failure (level circuit). Inoperable. Replace micro-
processor board.
• F9 in display indicates low voltage. Operative.
Fault codes F1 & F4 will be displayed when the failures occur, while F2, F3, and F9, if
present, can only be viewed after a key sequence of OFF and while holding OFF
actuate SLOW SPIN for 2 seconds. After the entire display turns on then off, the code
will be displayed. To re-test the water valve failure, water must.be run in the
machine. If F2 or F3 occur, the machine will default to both water valves on during the
Warm temp, 50% more hot water for Energy Hot and 50% more cold water if Energy
Warm.
To implement the lid switch test for welding, the lid must be opened between pro-
grams. If this does not occur, "Iid" will appear in the display when the next program
is selected. This must be cleared by lifting the lid before a program can be selected.
If opening the lid does not clear the "Iid" from the display the assumption is that the
lid switch is welded. The test does not occur if the cycle is ended by the pressing of
the OFF-KEY, only if the cycle ends naturally.
DISPLAY DIAGNOSTIC:
The display can be viewed with all segments on for 4 seconds after a key sequence of
OFF and while holding OFF actuate Pause for 2 seconds to activate.
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©1994 Maytag Corporation
SECTION 4. TROUBLESHOOTING
4-5