My master bath has 2 switches.
The switch on the left (1) goes to the light. The one on the right (2) goes to the fan.
The light works fine. The fan only works intermittently. It takes 2-3 flips of the switch for the fan to come on. I've replaced the switch and the fan (it was old). I've sketched the circuit the best I can.
As you can see from the picture, A, B, and C are all in the switch box. There is one cable coming into the box and 2 going out. I've traced the cable to the fan through the attic and verified there are no other junctions.
I've got a multimeter and I've done voltage tests across every combination of the switches with ABC and everything on switch 2 seems to match switch 1 (when working and when not working).
Edit - tonight I swapped the black wires between the 2 switches (still using the quick connects for now). Same results. Fan still intermittently works but the light works fine. One thing I noticed during this process is that if I turn the fan switch from on to off and back on again very quickly, the fan works everytime. Is this at all significant?
Edit- I then disconnected and reconnected all the wiring within the box and connected the switch ground posts. I also used the screw posts instead of the quick connects. Same results. I was about to climb back into the attic to pull out the fan and return it when I decided to read the troubleshooting table in the manual. I've bolder the above from the previous edit for a reason. see answer below.
Is the only option at this point replacing the cable? Or am I missing something?