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You probably will find that the vent is clogged with grease. A switch device works with the vent so the fan operates only when the vent is open and does not operate when the vent is closed. Things should get back to normal after a thorough cleaning unless the fan is defective and won't operate at all.
The fan switch contacts are probably welded together or the actuator mechanism is broken. Your best bet is to replace the fan switch, probably with a similar type having a higher current rating so the new one won't also be susceptible to contact welding. If you have an industrial electrical supply dealer or electronic surplus parts store in your area, those would be good places to look for a replacement.
To replace the light bulb:
1. Remove the right filter and turn off the main power
2. Gently push the suction cup on the light replacement
tool A (provided with you range hood)
onto the lens of the light bulb B .
3. Turn the tool counter-clockwise until the bulb
4. Remove the tool from the bulb and put it on the
lens of the replacement bulb.
5. Screw the new bulb into the light fixture clockwise
until it is tight. Turn on power at the fuse or junction
box. Turn on the main power switch and touch
the light key to make sure it is working.
6. Replace the filter. You can download the manual here.
unplug the unit and unscrew the bulbs. put 2 new in if they still dont work then you may have fried the control. there are usually no fuses between the control and light/fan. well i never saw a fuse between the 2.
Your problem is: This hood worked fine until a light bulb blew out. Put in a new light bulb, but the lights will not turn off. Is the light switch bad or is there a problem with the control panel? The fan still works fine but the lights will not turn off or adjust dim or bright.
You're on the right track. The light control switch needs replacing. You might try utilizing the Repair Directory to find a repairman. If you have the tools and ability just remember to turn off the electric first.
Feel free contact me again! Please give me a rating here at fixya.com before you sign off Thank you, Harvey your Master Plumber
If you're getting 120V at the lampholders, yet it's not lighting lamps that still work perfectly well in other fittings, two possibilitiesspring to mind.
One is that the cap on the bulbs isn't quite compatible with the fitting. Assuming they're some variant of Edison Screw, make sure that the centre terminal in the lampholder is sticking out far enough to touch the terminal on the bulb. Also check whether the lampholder achieves it's outer connection just with a small tab, rather than with the whole of the threaded ring. If so, make sure that this is going to touch the appropriate part of the bulb.
The other possibility is that you've got a high resistance connection somewhere - not enough of an open circuit to drop the 120 V when feeding the Megohm load presented by a meter, but more than enough to kill the supply when you have a lamp load. Only way to chase this is to use the meter on ohms range to bell out all the wiring between the lampholders and bits of the system which do work properly.
If you have 120VAC on the center contact of the light socket, and a working fan, but the bulb won't light...the most likely cause would be a disconnected neutral wire (white) in the light wiring inside the hood....assuming everything else is wired correctly.
If you're comfortable with further electrical testing...let me know, and I can describe a detailed procedure to check the status of the neutral wire. Otherwise, you may need the assistance of someone familiar with electrical troubleshooting or appliance repair.