Thermador Oven - stuck on broil

[Bison1]

Have an older Thermador double oven SC272ZS.  The upper oven is stuck on broil regardless of the mode chosen (bake, convection, etc).  Maybe a stuck relay?  How to troubleshoot?

[citizenX]

So if the display says it's on bake, for example, but the broil element comes on 100% then yes it sounds like a stuck relay. Just looking at a parts look up, it shows two relay boards and a couple other relays up top but not sure which is for which oven. If there is a wiring diagram on the unit somewhere it may show which specific relay is for the the broil. You can try tapping on the broil relay on the upper oven relay board (no idea which exact relay it would be though) with a screwdriver handle to see if you can un-stick it. Sometimes you can just get a little bit of arcing on the relay contacts and tapping on it will unstick it, but if it is shorted and fused internally then tapping on it won't help. Even if it unsticks there is a good chance it will just stick again at some point. I don't think that board is even available anymore though so hopefully you can get it unstuck. There are companies online that will rebuild certain boards but you'd have to contact them to to find out if yours is one they will do. Sorry can't be much more help than that. 

Edited November 10, 2024 by citizenX

[Bison1]

Thanks - it was a stuck relay.  Not hard to diagnose once I opened it up as the circuit board had carbon marks around the relay from when it blew.  Tested closed.  I sent it off to online repair place and it's on it's way back, about $200 to repair.

[citizenX]

Sweet. Glad it was relatively easy. Hopefully you get some more good mileage out of that unit.