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Hello, in order for the humidifier to turn on and off with the furnace you need either a sail switch or current sensing relay. A sail switch mounts in the return air duct and senses the return air when the furnace turns on thus turning on the humidifier and turning it off when the airflow stops. A current sensing relay works the same way but instaed of sensing airflow in senses current on the blower motors common lead and is easier to install than a sail switch. I will post a pic of both
The "F34" code on your model of Thermador oven indicates the control has detected an error with the airflow for the oven. This could indicate a faulty blower motor not coming on at all, or if it does come on ( you should be able to hear it or feel it blowing out the bottom under the door if it's working ) and still initiates an F34 error it is likely the sail switch is sticking.
The switch can be removed and cleaned as they do become contaminated with dirt, grease and dust over time.
The sail switch is located at the very bottom of the ovens where the grill is, under the lower door.
The blower is located at the back wall of the oven plenum as illustrated here.
( F34 can also be initiated by a failed "K4 relay" on the control board, but that is less likely )
The sail switch as I mentioned can be accessed by way of removing the lower grill...i.e.
**Turn off the 40 amp breaker to the oven before attempting any service...safety first** If you feel capable this is the procedure for testing the blower and sail switch as follows...At this point I recommend calling in a pro, it's your call.
Let me know if I can assist you further regarding this issue and I`ll try to be available asap.
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Review figures 5, 6 and 7 on the installation instructions and compare with how you wired your installation.
The red wires are not used if you use a mechanical humidistat, (are used with electronic humidstat - supplies 24 volts and go to "hot", "commod" on humidstat). Yellow wired to "Hum" whether electronic or mechanical humidistat used.
If using sail switch or current sensing relay, cuts into one of the yellow wires. - One yellow goes directly to humidisat, then comes out of other side of humidistat & runs to to relay (or sail switch), and comes out of relay (or sail switch) and runs back to humidifier.
Hi, i found out from Thermador customer service that error code F64 means that the lower fan switch (located inside the bottom trim on the right side) is not being detected as closed. In my case, this was because the header (P4) on the Display panel had broken loose from the PC board and was no longer making contact. P4 is where the lower fan switch wires connect to the control boards (actually the display panel).
A sail switch is a Blower "on" proof switch. It's purpose is to prevent equipment such as air cleaners and/or humidifiers from energizing unless the blower is running. The sail switch literally has a sail that is put in the ductwork. When the blower starts, the airflow will push the sail so as to close a switch allowing accessory equipment to operate.
I hope you find this information to be very helpful to your moving forward. Let me know if you have any further questions, comments, or concerns.
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.
Lower oven cooling fan air switch not detected
Replace air switch,replace cooling fan,check connections, check P6 on PCB
control display. f64 fault code is an issue with the lower oven cooling fan motor and, or (air) sail switch