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Maytag Dishwasher Electronic Diagnosis
PCB Assembly Diagnostic Tips for Maytag/JennAir dishwashers MDB6100, 6150, 7100, 9100, 9150 & JDB7910, 8910, 9910
- If the cause is a "dead not working" dishwasher, ensure that the wiring is properly located and attached to the PCB assembly. Check the door switches, check the main wire harness coming into the d/w. On some assemblies a jumper wire with dual terminal on one end is used. When attaching the wire from the main harness to the dual terminal, the possibility of a loose connection may occur causing improper voltage to the PCB. If the PCB board has a burnt trace on the back of the PCB, A shorted triac on the PC board may be the cause. The motor start winding may have been damaged, which should be checked at the same time.
- If the complaint is "All lights are flashing", interrupt power to the dishwasher for 1 minute, then re-apply power. If the lights are not flashing, may not be a PCB problem.
- If the "Clean & Option" keypads appear not to be working, but the "Auto clean" keypad does, disconnect the wiring at the turbidity sensor. If a cycle and any option can now be entered, replace the turbidity sensor.
- If the "Clean & Keypad 7 LED" are flashing, this is the code for an incorrect "Memory Software Check". Interrupt power to the dishwasher for 1 minute, then re-apply power. If the lights are not flashing, the PCB may not be your problem.
A manual Function test for PCB dishwashers
A manual function test may be started by pressing the keys in the following sequence within 10 seconds.
Click image for larger view
The dry LED will FLASH indicating manual test mode active. Specific keypads will turn on or off a component as follows:
Keypad 2 - Motor circulate
Keypad 3 - Water valve
Keypad 4 - Soap dispenser ( lid closed ) Rinse Aid ( lid open )
Keypad 5 - Vent
Keypad 6 - Heating element
When a component is activated by pressing a specific keypad, the LED above the keypad will be ON. The test will cancel 120 seconds after the last keypad is pressed. To cancel test, press the Drain/off keypad.