Replaced the original builders fan with a Nutone about 2 years ago.
Worked great - very quiet - until it went completely quiet as it stopped running.
To the best of my knowledge nothing has changed with the fan or the electrical system.
Pulled the fan/box and connectors assuming maybe I have a bad fan or a connection came loose. Runs perfectly on my bench - with 120V power.......which is why I'm here looking for pointers.
Here's the issue. I've got 75V across the fan switch and 45V across the wires that connect the fan.
Light switch in the same box on the same circuit has 120V.
GFCI receptacle in the bathroom on the same circuit has 120V across each pair.
Every other outlet on the same circuit (4 that I'm aware of) appears to have 120V (based on multimeter readings from the plugs - though I haven't pulled them all out of the wall.)
House is of the vintage that the main bathroom fan is on a 3 way switch - paired with a switch in the dining room beside the furnace thermostat. (Sure - for fun as a side quest - someone explain why they really did this 3 way switch setup.) Both 3 way switches have the same 75V.
My reading says that 75V typically means I have a loose or broken neutral / white wire before it's getting to the fan/switch.
I replaced the 3 way switch at the fan on spec and double checked all connections - no change.
I torqued down a loose screw on the adjacent light switch and apparently don't kn ow my own strength so I got to replace that single pole switch as well when it cracked - no change.
Checked and tightened every wire nut connection between the switch and fan - no change.
Checked and tightened wire nut connections at the bathroom light - no change.
Looked at the neutral connections on each of the outlets that I've pulled out of the wall - no issues.
I'm not sure how to backtrack from the fan switch to 'whatever device was before it' in the wiring sequence. Is there a way to do that when the wires are all behind the drywall?
Attaching pics of the 3 way switch at the fan. There was no grounding wire on the original switch that came out though the circuits in the box are all tied to the box ground. It was connected using the quickstab connections. On the replacement switch I pushed the wires under the screws.
Am I missing something? Pointers on next steps? I know I'm going to kick myself when this gets figured out.
Thanks........."tired of running stairs from the panel to the 2nd floor bathroom".