Maytag MAH5500BWW Service Manual - Page 35

SECTION 3. TROUBLESHOOTING Warning - Always shut off electrical power to the unit before beginning any service repair procedures. Shuts OFF When Push-To-Start Button Released: Check for proper wiring of BK 27 to COMM Washer Runs Five Minutes Then Shuts OFF: During the wash cycle, the machine control communicates with the timer, via the timer input circuits. If the machine control board does not see a change in timer inputs over a period of 5 minutes, it will open the line relay and shut the washer off. Check the timer input circuits for poor connections at the timer and the machine control board. Replace timer if necessary (See Section 2: Timer Input Circuits). and GY 26 to NO. If reversed, the washer will shut off when button is released. If wiring is proper, replace machine control board. Line Shuts OFF In The Middle Of The Spin Cycle: relay may be bad (See Section 1: Push-ToStart Line Relay Operation). Runs For Five Seconds Then Shuts OFF: Suspect a communication problem between motor, the motor control board and the machine control board. Check the motor and motor control system by removing the JP4 connector on the motor control board. Set the timer dial into the delay cycle and then press the push to start switch. If the motor operates and the washer goes into a 50 rpm tumble, then the source of the problem is the RD 30 wire leading from the motor control to the P4(2)/RD30 connector on the machine control board. When the machine control tells the motor control to run the motor, it monitors the red wire to determine if the motor is actually running. If the board does not see a return signal, the washer will shut down. If RD30 wire is making contact, then suspect possible problems with timer input circuits. (See the following section on Machine Operation Does Not Match Cycle Description): During the spin cycle, the machine control monitors the door lock mechanism to ensure the door is locked. This is done through the door lock enable switch. During "lock mode," the shaft of the door lock mechanism is pressed forward by the door lock wax motor, and the shaft presses in the button of the door lock enable switch. If the machine control board sees the switch OPEN during the spin cycle, the machine control board will automatically shut the washer OFF. This is caused by a weak spring in the door lock wax motor. Replace the complete door lock mechanism. Shuts OFF During Final Rinses: The machine control board is programmed to allow a maximum continous fill time of six minutes or an accumulated fill time of 8 minutes for each full wash cycle. If the required fill time exceeds the time limit, the washer will shut down. This is to prevent flooding in the event there is a loose hose clamp or damaged air dome hose. Check the incoming water lines for a minimum pressure of 20 psi. If lower, the customer can use smaller clothes loads and reduce the pressure to 10 psi. An alternative solution would be to change the plastic inlet screens to metal screened washers and remove the nozzle extender found in the water valve inlet hose near the dispener inlet. 16008373-01 © 1998 Maytag Corporation SECTION 3. TROUBLESHOOTING 3 - 1