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The Adjust dial on the control unit, I'm having problem when I turn the dial it sometimes goes back when I turn forwards. This also happens when I turn the dial slowly it sometimes don't change the numbers for e.g when I'm on pulse and I want to change the pulse rate from 50 to 55 it sometimes don't register that i'm turning it. I only get this with the adjust dial.

I've been using the connect app to get around not using the adjust dial and works fine.

Any help would be greatly appreciated

Try doing a "Factory Reset". Which firmware version are you using?

Recommendation of our admin: "Encoders, as they are a moving part do degrade over time, strangely they tend to be worse if you don't use them. Push down on them (not too hard) and give them a few fast spins left and right."

I’ve tried a factory reset but did’t fix the issue. The firmware is 2.106 what I currently have.

If you don't know any further pls. contact the support for further assistance. If your device has a hardware problem, they can certainly help you. The 2B comes with a lifetime warranty ...