Buck converter not behaving as anticipated with new trim pot resistors

Question

I recently purchased a 300W buck converter from amazon 1 which has two 3296W 100K trim pots to control the constant current and constant voltage output. My plan was to use them as bench power supply for which i replaced these two pots with a panel mount 100 K linear potentiometer [2]. While I undertand that the 3296W are multi-turn resistor, I was expecting I'd get the same response from the new potentiometers just in a single turn however the new pots aren't working the way they should. The output voltage is not working and I am getting fixed 22V out for 24V input irrespective of the pot adjustment.

What am I missing here ? Replacing trim pots should be basic and should'n have affected the way buck converter behaves.

1 https://www.amazon.com.au/dp/B0C2YQPQXR?psc=1&ref=ppx_yo2ov_dt_b_product_details

[2] https://www.amazon.com.au/Glarks-5K-100K-Knurled-Linear-Potentiometer/dp/B081GZBL8T/ref=sr_1_1_sspa?keywords=100k%2Bpotentiometer&qid=1696162452&sr=8-1-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&th=1

Answer 1

What am I missing here ? Replacing trim pots should be basic and should'n have affected the way buck converter behaves.

It could affect it so much that the device goes unstable and burns. On the other hand, you might get a quite unstable output or, if you are really lucky it might work. But, the chances are that something unpredictable will happen.

The trimmer pots are connected to the most sensitive part of the circuit and any extra capacitance (wiring to ground or a bulky panel mount potentiometer) will likely make the output unstable. Plus there's the inductance of the extra wiring to throw into the mix.

_{Pretty much all devices bought from Amazon (and several others) have no data sheet and haven't been designed with any thought about you making modifications to them. They also have quite a debatable manufacturing provenance and, designs are likely to change without you being informed. In short, don't use them for things like this or expect them to perform beyond their fairly limited specifications.}