If your control knobs have basic cosmetic damage, they are relatively easy to slide off and replace. If the switch itself has snapped, it can also be replaced - as shown in this eSpares video.
View All Cooker & Hob Control Switches »Video Transcript:
Hi there, I'm Rory from eSpares, and in this video I'm going to show you how to replace the function switch and the control knob in this Zanussi built-in oven.
Now, if it's just cosmetic damage to the control knobs, these are really easy to replace they just slide on and off. But as you can see, the spindle of our function switch has actually snapped off so I'm going to need to replace the whole thing.
Safety first, before you get to work, do remember to unplug your oven.
There should be a switch in the general area of the oven, or it could be in one of the units above or below. Make sure it's switched off.
Now the first thing you'll need to do is remove the built-in oven from its cavity. To do that, you'll need to remove the four screws situated here and that way you can then lift out the oven and disconnect the power cables from the back. So once you've got the oven in an open space, disconnected and out of the cavity, you can get to work.
first thing you want to do is remove this top panel here; there's four screws holding this one into place as well. You'll need a Torx Head Screwdriver to remove these screws. You can buy a Torx set on the eSpares website. I'm just going to use a Torx bit on the end of the driver. So here we have our function switch in all its glory. It's held in place at the front by two Torx head screws, you'll need to remove them, and at the back you can see it's wired in a very complicated way.
Now you must make sure when you wire in the new switch it goes in exactly the same way as the old one. So I'm going to use a combination of magic marker and a camera so I can wire it in exactly the same way and then undo the two front screws. Putting the new switch in is easy, just do the exact reverse of what you've just done, put the switch in, put the screws back in and then wire everything in the exact same way as the old switch was wired.
Now all you need to do is put the top panel back on, and then of course you'll need to put the built-in oven back in its cavity. Just do the exact reverse of what you did earlier when you took it out. There you go, easy, and that's your control knob fitted as well.
Control knobs and function switches for all make and model of cooker are available at the eSpares website.
Thanks for watching.