Thermador Wall Oven Not Heating Inconsistent Temperature.
Does your Thermador or Bosche oven have temperature control problems? Overheating or not heating all? It could be caused by a faulty circuit board. The following post describes the behavior of a properly working control board in pre-heat. This applies to the following model series: SCD27, SCD30, SCE30, SCE70, SC272, SC301, SC302, SMWS7, SMW27, SM272, SVD48, S272T, S301T and S302T. At www.FixYourBoard.com, we hear about problems such as the oven taking too long to heat, temperature fluctuations in the oven, oven is burning food or there is no heat at all. We’re here to help solve these conundrums.
First, the picture below shows the relevant connections that should be measured to ensure that the elements are correctly turned on by the relays. This picture is an example of part 492067 which is the power / relay board. Its purpose is to provide power to the oven, turn on heating elements and fans, and communicate with the display board.
These ovens can be tricky to troubleshoot, but start with the following table which shows how the timer is controlling the heating elements and cooling fans. Note that an AC voltmeter must be used to perform the following checks
Thermador Pre-Heat Cycling
| PRE-HEAT MODE | BAKE TO L2 | BROIL 1 TO L2 | BROIL 2 TO L2 | DLB RELAY | COOLING FAN RELAY |
|---|---|---|---|---|---|
| Bake Mode | On 50 sec = 0VAC Off 10 sec = 240VAC |
Off 50 sec = 240VAC On 5 sec = 0VAC |
Always off = 240VAC | Always on = 0VAC | Always on = 0VAC |
| Convection Roast |
Always off = 240VAC | On 30 sec = 0VAC Off 30 sec = 240VAC |
On 30 sec = 0VAC Off 30 sec = 240VAC |
Always on = 0VAC | Always on = 0VAC |
| Convection Bake Mode | Always off = 240VAC | Always off = 240VAC | Always on = 0VAC | Always on = 0VAC | Always on = 0VAC |
| Broil Mode | Always off = 240VAC | Always on = 0VAC | Always off = 240VAC | Always on = 0VAC | Always on = 0VAC |
Relevant model numbers: 1065923121 , 1065923160 , 1065923161 , 1065923200 , 1066025120 , 1066025150 , 1066025151 , 1066025160 , 1066025201 , SCD272T , SCD302T , SCE30500W , SCE30600B , SCE70600B , SCE70600W , SC272T , SC301T , SC302T , SMWS72YP AFTER S/N 8204 , SMW272B , SMW272P , SMW272S , SMW272W , SMW272YB AFTER S/N 8204 , SMW272YS AFTER S/N 8204 , SMW272YW AFTER S/N 8204 , SMW272ZS AFTER S/N 8204 , SM272B , SM272S , SM272W , SM272YB AFTER S/N 8204 , SM272YS AFTER S/N 8204 , SM272YW AFTER S/N 8204 , SM272ZS AFTER S/N 8204 , SVD48600B , SVD48600PF , SVD48600PG , SVD48600PK , SVD48600PR , SVD48600PT , S272T , S301T , S302T
Relevant part numbers: 35-00-760, 12001691, 492071, 14-38-901, 492069, 492067
I hope you found this guide helpful!
Regardless of what you may hear, the control boards on all appliances are repairable. Many times, control board repair is the only option because they are obsolete or no longer available from the manufacturer. Call FixYourBoard.com to have your control board remanufactured quickly, with an industry leading two year warranty.