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Hello and welcome to just answer my name is ***** ***** I will be the one to assist you. It sounds as if your sail switch is not opening which is located in the front of the door. 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 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.
So what you can do is bend a metal coat hanger and use it to pull the switch forward to "unstick" it. If that does not work then the switch needs replaced.
do you not see it in the front of the door? Like in the picture I sent you?
that should be it then.
the error code 43 is the cooling fans not the gas valve at all. Now you said you replaced the cooling fan did you replace them both?
Sadly I am not able to access the service manual for your unit this evening the site is acting up so I am unable to pull up the location of the other one. It will just have to be looked for. Its more than likely still around the back area.