Where Do I Start with Thermador Oven Not Working Properly?

[gredmondson]

My friend's oven in his Thermador Range (model GCRG 364 GL
serial S311008) is not working properly. The problem is that very small movements of the dial cause big swings in temperature. For example, on the dial ‘off’ is at 12 o’clock, 150 degrees is at 3 o’clock, 350 is at 6 o’clock, and 500 is at 10 o'clock. When the dial is at 150 degrees the oven is at 350 degrees. (I have two oven thermometers in the oven) When the dial is at 200 degrees the oven is at 500 degrees. The oven cycles but I can’t get it be stable temperature below 350 degrees or between 350 and 500.

What should he check or replace first? The thermostat capillary? The thermostat itself? Any help would be appreciated.

George

 

[combo52]

Thermador Professional Range

Either the thermostat knob is installed backwards or you have the wrong knob on the oven control [ does the grill have a knob with degree settings on it ? ] or you need a new oven thermostat.

 

[lightedcontrols]

Also check...

If this oven is gas and you use the convection mode the temps will be all over the place. Both Viking and Thermador have this same problem. The only real fix is to not use the convection fan. If it's electric, then most likely the thermostat is the culprit. Both Thermador and Viking are aware of the problem with the convection mode but haven't seemed to actually fix the problem yet. This has been ongoing for about 5 years now. Lightedcontrols