I have a Broan 744 bathroom recessed fan/light. The light after about a year has started to flash on and off until it warms up. It has never done this before. What's wrong?

Here is a link to the instruction manual. Page three shows a wiring diagram for separate switches.
http://www.centralvacuumstores.com/meta/pdfs/info/744NT+Installation+Guide.pdf

This is the Switch NuTone Broan recommends for that fan.
http://broan.com/display/router.asp?ProductID=2949

Right now a single switch turns on both light and fan.
You want to put in a double switch to control light and fan separately.

But the problem is there is not a separate wire to each the light and fan.
You need a separate wire to each, but the circuit wasn't wired that way.
Usually when the circuit is wired for separate control, there is a red wire that also goes to ceiling box.

Unless you run another wire to the ceiling box, it won't be possible to control light and fan separately.

Electrician can do this pretty easily if there is attic space above bathroom.

They have opening clips on the top side all around the cover, you can reach it with your fingers and try opening them all, the cover will come off easily, once done you can unscrew the light bulb and install a new one.

Does it start before the mark as you turn it if so replace the switch. power off first and check with a meter.

Hi,

Either the plug came out, the receptacle wiring came loose or the bulb is out,,,

http://www.fixya.com/support/r6871896-broan_bathroom_fan_care_cleaning

heatman101

fan blades touching sides of housing,also runs caused by back draught

I ran into the same problem, Lowe's carries Broan exhaust vents. They had both a replacement motor for all generations of 678 fans for $18, and they also had the latest generation of the complete unit for $40. I bought the complete unit, which included the fan I needed. Just unbolted it from the new bracket and bolted it to the old one. The new light housing, trim piece, and lens also interchanged. The existing one was old and yellowed, so this made for a huge improvement. All done from in the living space as well.

Hi,

go to www.broan.com from there you can look up that fan/light combo and download the installation manual which will give you the exploded view.

Broan Bathroom Fan Care and Cleaning

heatman101

You'll be able to access the motor to service it and the wiring junction box from inside the bathroom. Please rate this answer if it was at all helpful.

probably you cross the wire, read the manual, check the wire first.

connect all the white wires together, connect the black wire from the hot source to the one side of the switch and connect another side to the light, this is for the light. and do the same for the fan.

the factory use either red or the black for hot,white for the neutral and green for the ground.

I hope this can help you.

Frank