Service Error Codes - Maytag MDB series Service Manual

DIAGNOSTICS & TROUBLESHOOTING

Service Error Codes

DANGER
Electrical Shock Hazard
Only authorized technicians should perform
diagnostic voltage measurements.
After performing voltage measurements,
disconnect power before servicing.
Failure to follow these instructions can result in
death or electrical shock.
FUNCTION PROBLEM
CODE CODE
1-CONTROL 1-PILOT
STUCK ON
2-CONTROL
SOFTWARE
ISSUE
2-USER INTERFACE 1-STUCK
KEY
2-6 Maytag Chopper Dishwashers
n
For Service Technician Use Only
CAUSES
CONTROL DETECTED K2 PILOT RELAY STUCK
CLOSED.
ALL LEDS ARE ON.
DAMAGED OR CORRUPTED MEMORY ON
CONTROL BOARD; INCOMPATIBLE SOFTWARE
COMPONENTS INSIDE MICRO.
CONTROL DETECTED STUCK KEY(S) IN KEYPAD
OR KEYPAD CONNECTION.
NOTE: IF ANY KEYS ARE STUCK, THE STUCK
KEY(S) WILL BE IGNORED AND AN ERROR
RECORDED TO SERVICE HISTORY, BUT NO ALERT
TO CUSTOMER.
WHAT TO CHECK
1. UNPLUG DISHWASHER OR DISCONNECT POWER.
2. CHECK ALL LOADS ON K2 PILOT RELAY FOR SHORTS.
3. REPLACE CONTROL AND ALL SHORTED COMPONENTS.
1. UNPLUG DISHWASHER OR DISCONNECT POWER.
2. REPLACE UI. (FOR MODELS WITH NUMERIC DISPLAY ONLY).
1. UNPLUG DISHWASHER OR DISCONNECT POWER.
2. REPLACE CONTROL BOARD.
CHECK RESPONSIVENESS OF EACH KEY.
1. IF SOME KEYS DO NOT RESPOND, THEN:
- UNPLUG DISHWASHER OR DISCONNECT POWER.
- DISASSEMBLE DOOR AND DISCONNECT KEYPAD CONNECTION
FROM CONTROL OR LCD DISPLAY MODULE.
- VERIFY ALL OTHER CONNECTIONS TO CONTROL ARE MADE.
- REASSEMBLE DOOR BUT DO NOT CLOSE DOOR (LEAVE KEYPAD
DISCONNECTED).
- PLUG IN DISHWASHER OR RECONNECT POWER.
- WAIT AT LEAST 7 SECONDS FOR CONTROL TO POWER UP
COMPLETELY.
- CLOSE DISHWASHER DOOR AND MONITOR CONTROL
RESPONSE:
A. IF CONTROL IS OK (NO LONGER SEES STUCK KEYS WITH
KEYPAD UNPLUGGED), IT WILL RESPOND BY TURNING ON
THE DRAIN MOTOR FOR 2 MINUTES. REPLACE KEYPAD AND
CONSOLE.
B. IF CONTROL IS NOT OK (STILL SEES STUCK KEYS WITH KEYPAD
UNPLUGGED), IT WILL NOT TURN ON DRAIN MOTOR. WAIT
FOR AT LEAST 10 SECONDS. IF STILL NO DRAIN RESPONSE,
THEN REPLACE CONTROL OR LCD DISPLAY MODULE
(WHICHEVER ONE THE KEYPAD WAS CONNECTED TO).
C. IF ALL KEYS APPEAR OK OR INTERMITTENT, AND KEYPAD IS
CAPACITIVE TOUCH TYPE, THEN:
- VERIFY TUB BRACKETS ARE SCREWED TO UNDERSIDE OF
COUNTERTOP AND NOT HANGING OVER KEYS (IF SCREW
HEAD TOO CLOSE, RELOCATE SCREW TO ALTERNATE HOLE).
- CHECK FOR EVIDENCE OF MOISTURE OR DEBRIS ON THE
SURFACE OF THE KEYS. IF EVIDENT, CLEAN AND INSTRUCT
CUSTOMER ABOUT KEEPING SURFACE CLEAN.
- CHECK ERROR CODE HISTORY FOR FAN ERROR 10-3 AS
POTENTIAL CAUSE OF CONDENSATION ON USER INTERFACE.
- VERIFY PRESENCE OF VENT CURRENT IF MODEL HAS A VENT
WAX MOTOR. REFER TO "LEAKS OR DRIPS ON CABINET OR
FLOOR" IN THE "TROUBLESHOOTING GUIDE" SECTION.