Answer Hello Paul, The temperature sensor WB20K10027 should read about 1100 ohms at about 70°F. You should thump it while testing to ensure no intermittent connection is present. If the reading is more than 10% out of tolerance, it should be replaced. If it reads correctly the same reading should be taken at the control where the harness connects to the control board. If this reading is good and the ignitor WB13K10043 glows yellow to white hot, the board WB27K10434 should be replaced. As a note, the ignitor should also not have a white spot on it. This would indicate a failed ignitor. Read More... Answered by AppliancePartsPros.com | Saturday, December 2, 2017