Wahoo sent me a replacement sensor and I've installed it and the spin-down worked first time. Kickr is great now but... the flywheel is making a rattling noise. Anyone else have that? Also, the Blue SC cadence sensor is not picking up - perhaps because there's no wheel magnet. How do you fix that? Any suggestions gratefully received.
Are you talking about the cadence-only sensor, with the accelerometer rather than a magnetic pickup? It's an ingenious application of inexpensive technology -- same accelerometer chip as in the iPhone and other devices -- but for some reason I've been having problems with it too. I think the problem is actually with the Wahoo Fitness software. In settings I turn off the cadence sensor and then turn it back on again, but as the speed/cadence sensor combined. The software seems to like that sensor a lot better than the cadence-only one. You do have to switch the speed reading back to the Kickr or it'll just read zero (there's no wheel magnet actuating the speed-cadence sensor for a speed reading, after all). Then it works just fine, even though you are pairing it with what is supposed to be the speed-cadence sensor in the software.
I do also find that all the sensors are slow to pick up. The cadence-only sensor is the most problematic in this. I find that sometimes the blue LED in the sensor starts blinking right away; other times it doesn't seem to light up, and I'm not sure whether that's a problem or not (the LED would be a hardware problem of course not software). Once everything connects, it is very stable, but the slowness is greater than for ANT+ sensors I have, which again makes me think the Wahoo Fitness software could stand some improvement. I'd recommend you check both your bluetooth pairings in System Settings -- you should see heart rate monitor, cadence sensor, and Kickr -- and then do the Wahoo Utility, and then the Wahoo Fitness program. You might need to disconnect and reconnect a balky sensor, but then it works immediately. If your Kickr doesn't show, be sure that you have power and speed set to read from the Kickr and not from the speed sensor or other sensor that isn't installed. Again, once going, it's very stable.