Is there any polarity on a2 wire 2uF 450v fan running capacitor

The Start/Run Capacitor has failed. The capacitor give the motor a voltage jolt to get it going.

Capacitor - 7uF

Fisher & Paykel https://www.fisherpaykel.com > laundry-spare-parts

Capacitor 7uF for Dryer. 400V. Note: Does not suit some older models with an Emmerson (square) motor. Capacitor - 7uF. $ 43.83. Add to Cart. $ 43.83Each.
A$43.83

Capacitor 7uF 450V Fisher Paykel Dryer ED57, AD55AU ...

eBay https://www.ebay.ca > itm > Capacitor-7uF-450V-Fish...

Capacitor 7uF 450V Fisher Paykel Dryer ED57, AD55AU 93214A, ED56AUFP, AD55AU ; Type. Capacitor ; Installation. Built-In/Integrated ; Compatible Model. ED57, AD55AU ...
A$12.95

Fisher & Paykel Dryer Capacitor for Motor 7UF Microfarad

Steve's Appliance Spares https://www.appliancespares.nz > products > fisher-pa...

Genuine ICAR Capacitor Genuine Manufacturer used by Fisher Paykel for dryers, ActiveSmart fridge-freezers and sold by spa pool stores across NZ DUCATI.
NZ$13.03 ..

Should work fine. This is only 10% difference and manufacturing tolerance is typically 20% for this kind of component.

The Start/Run Capacitor has failed. The capacitor give the motor a voltage jolt to get it going. A 'humming noise is a giveaway for that issue.

Capacitor - 7uF

Fisher & Paykelhttps://www.fisherpaykel.com > laundry-spare-parts

Capacitor 7uF for Dryer. 400V. Note: Does not suit some older models with an Emmerson (square) motor. Capacitor - 7uF. $ 43.83. Add to Cart. $ 43.83Each.
A$43.83

Capacitor 7uF 450V Fisher Paykel Dryer ED57, AD55AU ...

eBayhttps://www.ebay.ca > itm > Capacitor-7uF-450V-Fish...

Capacitor 7uF 450V Fisher Paykel Dryer ED57, AD55AU 93214A, ED56AUFP, AD55AU ; Type. Capacitor ; Installation. Built-In/Integrated ; Compatible Model. ED57, AD55AU ...
A$12.95

Fisher & Paykel Dryer Capacitor for Motor 7UF Microfarad

Steve's Appliance Spareshttps://www.appliancespares.nz > products > fisher-pa...

Genuine ICAR Capacitor Genuine Manufacturer used by Fisher Paykel for dryers, ActiveSmart fridge-freezers and sold by spa pool stores across NZ DUCATI.
NZ$13.03

..

Amazon ,
CEILING FAN CAPACITOR CBB61 1 2uf 2 3uf 3 wire UL listed FAST USA shipping...

Could be a shorted output rectifier (diode). This would cause a lot of current pull, and therefore voltage drop (fan slowing down). The electrolytic capacitors are for dc voltage, and will blow with wrong polarity, which means ac voltage would be the wrong polarity half the time.

Look for a capacitor. Have it tested, it may be a start capacitor for the motor, which would get it going the right way. Don't worry about polarity on the cap, but you can mark the connections if it looks important.

capacitor for run motor has gone most likely. on the motor you will find a black box with ether 2 black wires or one black and other white with something like cbb61 ac450. that has probably gone. they in most 2 phase motors and 3 phase motors like ceiling fans. dont cost a lot to replace just make sure it is the right uf rating can be 1 uf up but not down. so say yours is 1uf and you fing a 2uf it would be fine but a 4uf will make the motor slower.

no, the capacity is way too high.... get a capacitor of at least 1,5 uF or up to max 4 uF if you happen to have one lying around

nothing wrong with the power supply, or the remote, the speed switch in the fan is faulty, as it is more finiky than a manual speed change(like with a cable)

You can use any providing you can determine the max voltage in the device and the polarity.
If the capacitor in the unit has a wire out of each end and both ends have indents then it's a non-polar type.
Speaker capacitors for tweeters tend to be around 2uf.
The Voltage of the capacitor should be bigger than any voltage in the device.