If the above procedure caused the heater to heat up, the ADC board is probably bad replace it. The defrost heater should start heating up within 8 seconds. If the terminating thermostat is open when defrost is initiated, the ADC board will wait for six minutes and then return to the cooling mode.ĪSSUMING that the fridge has been on and running, and the terminating thermostat is closed, defrost is initiated by pressing the door (light) switch at least five times within six seconds. Note that the ADC will only enter the defrost mode if the terminating thermostat is closed. Vacation mode is not entered unless the door has not been opened in at least 24 hours. Maximum time between defrost cycles (in "vacation" mode) is 72 hours. Maximum normal clock time between defrost cycles is 12 hours.
![ge refrigerator control board test ge refrigerator control board test](https://i.pinimg.com/originals/4e/e4/a0/4ee4a0a04deea439e82667723670acd0.jpg)
Minimum time between defrost cycles is 6 hours. Maximum defrost cycle time is 24 minutes. If the terminating thermostat is closed, the first defrost cycle occurs 1 hour after initial plug-in. If terminating thermostat is open, the fridge enters a compressor (cooling) cycle. On the initial plugin, or when power is restored to the fridge after a power outage: If the heater, thermostat and thermistors test out OK, replace the main board. However, it is easier to just replace one or both of them. You can test these thermistors according to the table to the right. They are a control thermistor and a high-temp thermistor, which basically does the same thing as the terminating thermostat. There are two thermistors in the evaporator compartment, near the top of the evap. If not, the terminating thermostat is bad.
![ge refrigerator control board test ge refrigerator control board test](https://cdn.shopify.com/s/files/1/0451/9388/7900/products/57_dd126eae-377d-47c7-8540-b37955887245_1024x1024@2x.jpg)
When you reinstall the blue connector and turn the power back on, the defrost heater should heat up. You are testing through the defrost heater and terminating thermostat, so if you get either an open reading or no resistance, one of these components is bad. Using an ammeter, test the resistance between the blue wire on the blue connector, and the orange wire (pin 9, the last pin) on the J7 connector (this connector is marked N on the board, for "Neutral.") You should see 22 Ohms of resistance. Test the defrost heater and terminating thermostat as follows: unplug the fridge, and unplug the blue connector from the control board. If the refrigerator is not defrosting, because of the complexity of the control system, there could be a number of reasons. Maximum time between defrost cycles is 60 hours.
![ge refrigerator control board test ge refrigerator control board test](https://i.ebayimg.com/images/g/ZLwAAOSwh8pfDnKJ/s-l640.jpg)
![ge refrigerator control board test ge refrigerator control board test](https://images.bonanzastatic.com/afu/images/f341/a4cb/fc73_10225461354/__57.jpg)
Minimum time between defrost cycles is 8 hours. Maximum defrost cycle time is 45 minutes. Thus a thermistor can measure the temperature in a space and translate that into an electrical signal that a logic board can use.įor example, if the temperature in a space gets too low, the thermistor will tell the logic board, and the logic board can close an air damper to warm the space a little.ĭefrost intervals (time between defrost cycles) are controlled by the frequency and duration of freezer and fresh food door openings, defrost heater runtime and compressor runtime. The resistance of a thermistor varies inversely with the temperature of the thermistor the lower the temperature, the higher the resistance. Thermistors are simply variable resistors. In addition to defrost functions, this board gets inputs from thermistors and controls the operation of fans, damper doors and heaters throughout the refrigerator, as well as water-in-door, icemaker, ice crusher and auger functions. These machines use a very complex "control board" accessible at the right rear of the refrigerator.