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Re: Oven Fan Not Working Correctly
I am assuming this is a convection oven. There are only so many possibilities for this. 1) Bad fan motor 2) bad wiring from the board to the fan motor, 3) bad relay on the board. I recently ran a call on one of these and found a tech had replaced the oven temp. sensor had pulled it through oven cavity and in doing so pulled the wires loose from the fan motor, shorting out the board. Both had to be replaced.
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Do you mean the fan inside the oven box in the back wall. This is the fan for the Convection bake etc. If so this is how it works..
a) Bake feature - that fan does not come on
b) Convection bake - that fan comes on during bake cycle
So that fan works for several features but not for all. It helps to circulate the hot air inside better for a more even, fast bake.
Do you mean the fan in the control board area. It is there to get the hot air trapped in the oven walls out. Not the heat inside the oven bake box area. This fan works differently depending the model and/or brand. Some models fan works from the time you start. Some models fan comes on only when that area reaches a certain high temperature.
The fan does not produce hot air. It just circulates it. The thermostat turns on the heating element and the fan moves the hot air around. Unless you have an odd working machine. Baked bread for years an it only moves air for even heat.
Is the background cooling fan running? Also, look under the oven and if possible take off the kick panel and clean all the rubbish out to ensure the cooling fan can circulate air round. As a check, when you turn any part of the oven on ( Main/top/grill) the cooling fan will run and you will feel a cool draft of air coming out of the gap just above the top of the main oven door. If the fan is not running, this will cause the unit to overheat and the overheat thermostats to kick in, turning the oven off.
If the fan is not running, you will have to take the whole unit out to gain access to the back panel.
When you say the main fan, do you mean the background cooling fan or do you mean the circulating fan in the bottom oven?
Do you have the handbook for this oven as the wiring diagrams are included in it. If you haven't, you can take a copy from my BT Digital Vault - all I need is an email address to register you.
Looking at the diagram, the power for the cooling fan comes via the timer board. If, as you say, the fan doesn't work at all, the timer board could have gone faulty.
You have to ensure that the clock is set correctly with the time and it is in manual mode and nothing else is set on it.
Also that the background cooling fan has to be running as the oven overheat devices will kick in. This fan continues to run for about 10 mins, once the fan oven/top oven/grill is switched off. When it is running there should be a gentle draft of air coing out of the gap between the top and bottom oven doors.
Do you hear any relays operating when the fan oven turns off?
If your fan is blowing cold air, it's the air inside the oven that circulates. It has nothing to do with the fan. Convection circulates the existing air in the oven. Sounds like you might deselect the convection setting if this continues to happen. We have parts, so please let us know if we can help any further. :>)