Cooling fan motors are fitted to many ovens and cookers normally at the top rear of the oven cavity and they look like a drum, tube or cylindrical type of fan. These are known as tangential fan motors and can be constructed from metal or plastics.
There are some that are a little different, flat looking types seen often on ovens as well but these are not as common as the tangential type. And, there are a few low voltage ones that look like computer fans but, those are not common.
What they do is draw cool air into the oven cavity from the room and blow that colder air across the top of the oven cooking area onto the front control panel and often into the door. This helps to keep the control panel, control knobs and the door cooler than would be possible where there no cooling fan.
- In most instances the difference is very pronounced.
- In lower cost ovens and cookers these can be omitted, they are not fitted to all models.
What Controls The Cooling Fan Motor
The cooling fan motor can be controlled in two ways, the most common method is by what is known as a fan initiation thermostat. You can learn more about the control thermostat and the overheat in this article.
This small thermostat normally mounted on the rear or top of the oven cavity clicks closed allowing the live feed to the motor to be switched on, thereby bringing the fan motor on, when the oven hits a preset temperature. The temperature is set for that particle oven or cooker, it cannot be adjusted.
When the oven cools back down after use and the temperature drops far enough, the thermostat opens and the fan motor is switched off.
These are often on a permanent feed meaning that, even when you power off the oven or cooker that the cooling fan motor can still run for some time whilst the oven cools down. This is normal and the time that this takes will vary depending on how hot you were cooking, the ambient room temperature and so on.
The other method which is far less common and, more often found in lower cost ovens and cookers, is where the cooling fan motor is wired up with the oven switch (this can be done in various ways) and simply comes on when the oven is powered on and off when you switch it off.
Cooling Oven Fan Motor Failure
Problems with cooling fan motors are fairly common however, it is one of the few moving parts in an oven and they will wear out over time and, they operate at a fair old speed for extended period so they’re bound to fail at some point.
A Flat type oven cooling fan motor. When you look at a cooling fan motor, just as is the case with the oven fan motor, you’ll very often find that all they are are small induction motors that use brass or alloy bearings as that’s appropriate for the hot environment that they are in.
Over time those bearings will wear and the motor will either fail or become noisy. You can get screeching noises or jut rumbling and rattling from them but, any weird noises and chances are it’s either the fan motor for the oven or the cooling fan motor.
If you are stuck you can try to grease the bearings but this is a temporary solution at best as the heat will dry out the grease or lubricant and the fault or noise will return. In cooling fan motors this rarely works and, if it does it only lasts a short time.
If the blades are damaged then forget it, the only sensible option is to replace the motor.