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Thermador Wall Oven Not Heating Inconsistent Temperature

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.

Fixyourboard thermador power board 492069

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!

Thermador Wall Oven Not Heating Inconsistent Temperature

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.