In this video we are going to be taking a look at a Milwaukee Cordless fan. It has a weird fault as it works fine on speed settings 1 and 2, but shuts off on speed 3.

It does this on both the mains adapter and when using a M18 battery.

Let's take it apart, see how it works, and hopefully repair it!


Update 1:
Someone sent me a picture of the fan motor
https://imgur.com/a/DNk9AmP

It seems to be 18v 20w, so that would mean 20w / 18v = 1.111A ??

The power supply provided is marked 2.5a.
There is an internal fuse inside the fan, which looks original and isn't blown.
Are they putting too much load on the fan? as if it's drawing 2.6A at full power that would be 46w if I'm right.
I'm not 100% if the calculation works exactly like that with it being an inductive load.
Please feel free to correct me if I'm wrong! (I'm not an expert and just repair stuff as a hobby).


Update 2:
I've since tried running the motor at full speed by adjusting the current sense circuit (you could just wire the fan direct to the power) but the motor seems to overheat after an hour and a thermal cut out on the motor kicks in, so either the motor is damaged but the unit seems relatively new and has had little use, or they are putting too much strain / load on the motor as I've seem a few of these on eBay with the exact same fault












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