Oven Fan Motors
Fan motors are fitted to all fan assisted ovens normally at the rear of the oven cavity.
The purpose of this is to stabilise the temperature, in effect to distribute the heat more evenly though the oven cavity giving the user greater temperature stability and therefore more reliable and consistent cooking results.
This is largely the result achieved in a fan oven but it does vary from one oven or cooker to another and as we explained in this article, there are variances that you need to account for.
The fan essentially blows air across an element (for most, see section below) driving hot air into the oven cavity evenly and creating that desirable stable temperature in the oven cavity while “pulling” air back in to circulate creating a gentle cycle of heat in the cooking space.
There’s a lot to like about this as, apart from the more even distribution of heat so that you don’t get the same hot and cool areas you do with a static (non-fan assisted) oven aromas and flavours tend not to mix meaning you can cook fish next to fruit or veg and so forth without fear of one tainting the other.
What Controls The Fan Motor
The oven fan motor will normally be controlled by one method only as, whilst the fan element is in operation the fan motor must run of the element will overheat and quickly burn out, split or warp.
Therefore you will almost invariably see the fan motor being controlled by the main oven selector switch so that when you select the fan oven cooking mode that the fan motor is powered up along with the heating element.
There is very little variance to this method for the time being.
Oven Fan Motor Failure
Problems with fan motors are fairly common however, largely as it is one of the few moving parts in an oven and they will wear out over time.
When you look at a 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.
You will also often see a small fan mounted on the back of the fan motor, this is there to try to help keep the induction coil cool usually, it serves little other purpose. But, if that comes loose or whatever the fan motor will fail, usually quickly.
If you are stuck a stopgap can be 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.
Buying a Replacement Fan Oven Motor
We’ve never seen one of these units for which you can buy parts, it’s the full motor unit or nothing at all.
Thankfully however most of them are not that expensive, there are some that are of course but most are a reasonably sensible price with a number of low cost alternatives for the common fan motors as well.
If you are not sure what fan motor to order please ask as, they all look largely the same but there can be differences and, when you ask we can point out any alternatives that may be available and suitable.
We strongly recommend asking as, it can save you a lot of hassle and potentially a fair bit of money as well.
Replacing An Oven Fan Motor
Normally this is fairly obvious and easy for most people, the oldest part is usually getting to the fan motor in the first place.
To all intents, all of them will have to be removed from the rear of the oven or cooker so, the machine has to come out to change it out. Then, back panel off and you should then see the motor.
Some are fixed with screws from the front, so you need to get the rear panel of the oven off and out, some from the back but usually it’s easy enough to do.
Do be mindful of the thread for the fan on the motor though, most are reverse threads so the opposite of the norm to loosen and tighten.
There’s only two, maybe three electrical connections if there’s an earth tag so, wiring is not an issue and, it usually doesn’t matter what way around the live and neutral are.
Using some of the universal fan motors can be a bit more involved with the mounting etc but, they can be monumentally cheaper, in some cases anything from £30 to £100 cheaper, making looking at those very worthwhile on occasion.
Hybrid Ovens With A Fan Motor
We’ve seen a few fan assisted ovens that are more like static ovens, with upper and lower heating elements and a fan motor at the rear but without a fan oven element around the fan of the fan motor. These ovens probably have some funky marketing name but goodness knows what.
These operate on more or less the same principal as an oven with a fan heating element but are likely cheaper to produce without that and so these tend to be low cost ovens.