bathroomexhaust-fan
The bathroom fan/light went out and I replaced it. Apparently I did not hook wires up right.
There is a black encased wire with hot, neutral, and ground. There is a white encased wire with hot neutral, and ground. I hooked black to black on fan, blue to black, white to white and grounds to grounds.
When I turned power back on, the fan runs without light switch up. I swapped black and blue wires and the light stays on without switch on.
Help!
No way from here to know which wire fed the light or fan, but you have a continuous hot feed into the box that fed the receptacle, light and fan. The third wire, maybe it fed the fan or maybe something something else farther down the line, if the latter that needs to be tied in 100 percent to the hot feed. All whites still tied together, blacks to the dimmer from the light and hot. All grounds tied together set with a screw to the metal box. Securing the ground to the box is not needed if the box is plastic.
Before I got too wordy, here is a sketch
Still have to learn to format better
The sketch is a little rough, it should get the idea across I hope
Verify with a voltmeter that the fan is indeed getting 120V AC. If it does, and there's no physical obstruction to the fan blades, bring it back to where you bought it, the motor is faulty.
If there's no 120V, you'll need to check your wiring, and the switch. Any kind of automatic fan switch (humidity sensor, timer, etc.) is especially suspect. Replace it with a normal on/off switch and see if that solves the issue.
Best Answer
The black wire that is hooked up to the blue wire that keeps the light on, that is your always hot. Follow that wire back to the encasement and the white wire coming out of that encasement is your neutral. Hook that neutral up to only the white wires coming out of the fixture. Now take your always hot black and hook it to the remaining white wire in the other encased cable and mark it with some black tape. That wire now energizes the switch. Take the black wire in that encased cable and hook it up to the black wire and the blue wire from your fixture. Both fan and light should come on when operating the switch. Naturally, you want to turn off the power when you do any of this.