Oscillator not working - EdgeStar AP450Z Portable Air Conditioner

Question edited for clarity.
Question moved from Laundry Dryers.

There is a gear stuck or broken. It needs stripping and cleaning. Videos that should help.

https://www.google.com/search?q=allaire+no+16+fan+not+oscillating

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Oscillating fans usually have a drive pin that needs to be pushed in or pulled out to get them to oscillate. Have a look for one of these. They normally look like a knob or button sticking out?

S Adams, return for refund or replacement, sound like plastic gear inside could be damaged or loose. Check the attached links,instruction and guides, Good luck
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https://www.dyson.co.uk/support/am09/am09-white-nickel/my-machine-is-not-working/my-machine-is-not-oscillating
https://www.dyson.com/support/am0112/am01-desk-fan-12-silver-iron/diagnosis-root-menu/my-machine-is-not-oscillating-am01
Dyson AM 02 Fan not working oscillating feature is broken
http://www.dysoncanada.ca/en-CA/support.aspx

The purpose of a crystal is to regulate an oscillator circuit to the frequency of the crystal. It can also be used to filter a particular frequency from a mixed signal.

In an oscillator circuit, if the crystal is defective, the oscillator might still be working in an unregulated way or it might not work at all. If an oscillator circuit does not work it is just as likely to be one or more of the other components in the circuit that are faulty or a lack of supply current.

While there are probably modern solutions to the testing of a crystal-controlled oscillator or clock circuit, the original method would be to investigate the current supply to the circuit and check for function using an oscilloscope or a frequency counter. If the circuit seems ok but not oscillating the cystal is probably the easiest component to remove for testing, though it is probably easier and cheaper to simply replace it.
There are dedicated crystal testers available or it can be fitted to a known good oscillator circuit and checked as above. If the crystal is found to be ok (which is likely) the other components must be investigated/tested/replaced, which would be a highly specialised task and likely to be expensive.

Unless your motherboard is something really special and very expensive without many "miles on the clock" it is more practical, economic and convenient to consider the motherboard as a throw-away unit.

the first thing to check is that the remote control is working and the control panel of the fan itself are working probably and i think they did but you have to check first
this fan oscillating control button is not a mechanical connection like the regular fan so if you are not using it wrong(and i think you don`t ) an if all the buttons are working -except the oscillating function - (and i think they are ) turn that thing back and test it at the shop

its extremely simple... when it does that put your hand on the oscollator cover and hold it with light pressure for a couple seconds then let go. it should work

you can find it easy with google, but here is how it works...the incomeing rf signal is mixed with a signal of another frequency from the local oscillator and then passes through a non linear device (semiconductor). after passing through the nonlinear device the output will contain the original frequency,the local oscillator frequency, and frequencies equal to those added together and subtracted from each other,these signals are then passed through filters to obtain only one which will be either the rf frequency plus the local oscillator frequency or the rf frequency minus the local oscillator frequency. This new frequency is then coupled to the intermediate frequency amplifier stages where most of the amplification takes place before the audio is removed and passed to the audio stages.

try tofix the axle with some glue or so