Scott for Model Number SHX68R55UC/67 I have the Bosch Dishwasher model named. It runs completely fine with the major exception that the water appears to never get hot. I have looked at online videos indicating that a relay goes bad on the control board but my model of Bosch dishwasher does not appear to have any relays on the control board and the control board looks pristine. Should I consider thermistor replacement or the water heater? Are there any other parts that could be defective? Like I said earlier the only issue is that the water never get hot, otherwise the operation is normal. Thank you.
Answer Scott, There is a control board that is located on the right side of the unit down at the bottom that has to be accessed by removing the unit from installation. This control board is what has the relay on it but what you would first want to establish is whether the control board is sending power to the heater assembly. This can be done by running the unit through and testing the control board to make sure that it is sending power. If it is then the issue would most likely either be the thermistor having failed or the heater being defective. You can test the heater resistance and it should be approximately 11 ohms at room temperature. When looking at the NTC thermistor, it has a high limit and NTC in it. When looking a the terminals on the part, the 2 left terminals would be the high limit which can be checked to make sure that it is closed at room temp. For the NTC which are the 2 right terminals you will want to check the resistance Here are some temps that the resistance should read for the NTC, at 72 degrees should be 55K ohms, at 77 degrees would be about 48K ohms, at 100 degrees would be about 27K ohms, at 122 degrees would be about 17K ohms and at 145 degrees would be about 10K ohms. Read More... Answered by AppliancePartsPros.com | Thursday, January 14, 2016