Question about Thermador PG304BS Gas Kitchen Range

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Error code "43"?????

Getting error 43 from thermador stove/oven, can you please help to tell me what this means, and how to fix it?

Posted by art9090 on

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kcw118

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Thanks Marty for the info on the sail switch. We experience the same error code 43 problem. Seemed like the sail switch was stuck in the back position and didn't come forward when the fan started. So I bent a metal coat hanger and used it to pull the switch foward to "unstick" it. I tested the oven turning it on and off a few times and made sure that the switch moves forward with the blower fan starting when the oven was on, and moved back when the oven was turned off. Should be obvious, but make sure the blower is not running and the oven is turned off before you stick the wire hanger back there. A pretty quick and easy thing to try before calling the repairman.


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12_31_2011_10_07_56_pm.jpg

Posted on Dec 31, 2011

  • Alan B Nov 29, 2016

    Your pic made the difference! Thanks!

  • tom k
    tom k Feb 20, 2019

    Art, wasn't sure my model had a sail switch but after getting the blinking 43 code indicating faulting cooling fans began looking for the sail switch. Accessed the cooling fans and sail switch from the back panel reached down and moved the switch forward. The fans kicked on and stayed on while the oven heated to temp. Fantastic! Thank you. Tom

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Marty Barry

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I got the error code 43 on my Thermador oven and after much expense I learned it was something I could have fixed myself. First, the concept: there are two cooling fans at the back of the oven that draw air in from around the oven and blow it over the circuit boards that are underneath the burners. You can hear the fans and feel the air coming out the front of the oven above the door when the oven is turned on (not the range top). This protects the circuits from overheating. In front of each blower is a "sail switch", a little switch with a lightweight metal rectangle attached. When the fans are blowing (any time the oven is on), it pushes the sail against the switch, closing it, and notifying the oven that the cooling is taking place. If the switch doesn't close, the oven thinks the fans aren't working. Also, if the switch remains closed after the oven is turned off, then the next time you turn the oven on, it will also give the 43 error code. This is to avoid giving a "false positive" reading in case the sail switch gets stuck in the closed position. So: first visually check the fans and sail switches. Do they close and open when the fans go on and off? They may need to be cleaned a bit to remove grease and gunk. Also, some of the switches are installed at an angle that prevents the switch from opening up again when the fans go off, causing the "fail safe" error. Finally, if a switch is broken, you must replace it. But its an easy job, once you pull the oven out.

Posted on Oct 25, 2011

  • vito Oct 02, 2013

    amazing i had a techian coming by i moved the sail switch back and forth and it worked again just saved myself at leasr $200 thanks guys

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Anonymous

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Cooling fan error

Posted on Dec 27, 2009

  • kerrijanocha Jun 09, 2011

    so do we need a technician to fix, and is it worth it to fix this. I've had this stove about 3 years now and I HATE it. It's a replacement of the same one that we had so many problems with they finally replaced it ( after a year of 7 problems, this company [email protected]#$cks) any suggestions?

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Alan B

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We have a Thermador PDR304ZS and had the same issue with the range turning off after several seconds and the blinking blue lights (4 3 error code). Marty's and KCW118 fix explanations and photo are awesome. I carefully grabbed the "sail" switches (metal rectangle in front of each fan) and moved them back and forth many times until I could hear the switch click with each movement. I turned on the range and it stayed on! So helpful - thank you! My wife had just called and service tech was ordering parts to come in a few days. Wife is VERY happy. THANK YOU!

Posted on Nov 29, 2016

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