Model #GEW9250PW0, the customers dryer recently was subjected to some adverse power conditions after a prolonged outage in their neighborhood. After the power came back on, all the electronic devices in the home seemed to be fine, with the exception of the dryer. The display and indicator lights were no longer illuminated and pressing the buttons on the panel didn’t make any difference. At least the washer was still working.
Power surges and brown outs, where a temporary low voltage condition exists, can not only be annoying, but result in significant damage to not only your appliances, but any other electronic device in your home. These electronics which contain microprocessors require very specific voltages in order to properly perform their duties along with noise free connections to the electrical wiring in your home. This noise can come from anything plugged into an outlet and is the reason most semiconductor based electronics and appliances have some method to filter noise from the line, and to prevent noise from entering the line. But much of the real damage that occurs is from spikes of high voltage that simply happen to fast for these filters to block
It is possible to limit this damage through the use of surge protection devices either on each component, or the entire house, but the details of these products is well beyond the scope of this post. I will say, if it is worth protecting, such as the computer I am typing this post on, then looking into protecting your products may be something to add to your to do list.
The dryer in this home still had power going to it as demonstrated by the light inside the drum, but nothing else was working. A quick look at the wiring diagram shows each component connects to the control board, with the exception of the drum light and door switch. With everything else connected and controlled by this board, it made for a logical starting place for my search.
With the top panel removed and the control board accessible, I used by multimeter to check for voltage into the board. With 120 volts AC going to the board and no display, it looks like the board didn’t fare well from the power outage. The display itself is connected to the main board through two connectors that provide for button inputs and display outputs. It is a good idea to at least verify the function of the power button located on the front of the display. I say this because the control board is a rather expensive dryer part and it is a real bummer to buy the part, only to find the power switch was really at fault. To test the button, simply follow the steps in the machine tech sheet using a multimeter and if it is working, then we can be certain the control board has failed.
After turning off the power at the circuit breaker, and removing the wiring, I installed a new control board into this dryer. Once the wires were put back in place and power turned back on, the familiar display and associated tones were again as they should be. And the best news was it even dried clothes.