Customer Questions and Answers for Potentiometer by Bosch

Barry, without some testing, it can not be ensured if the potentiometers have failed. As both of the XLO burners are not operating at the same time, it would be more likely that the simmer control 00422882 has failed. This can be tested by turning off the gas and accessing under the cooktop panel. From there, the potentiometers can be tested by placing a volts meter on the DC setting and placing the red probe onto the L1 lug on the terminal block. From there, touch the black meter probe to terminal 3 on the LF potentiometer and it should read 5VDC when off, 4VDC when on, 1VDC when in the low setting, and 0VDC when in the XLO setting. If it does not read these voltages, then the potentiometer has failed. The same testing procedure can be done for the LR potentiometer. If either of the potentiometers fail, they are part number 00422749, however, Please note If your appliance serial number starts with 9706 on up use part number 00189819 which, unfortunately, is a discontinued item. If the potentiometers both pass testing, the controller has failed and would need to be replaced. Unfortunately, the controller has been discontinued as well.