My nutone 353 has been working well for the last 10 years, it has problem now. I was not able to stop the machine unless I unplug the cord. I suspect it was due to the defected relay which turn darkbrown in one corner. . IThje isolate relay is alco fr110. I was unable to find this relay but was able to find alco fr 105 in google search, I am not sure if it is ok to replace my old alco fr110 for my nutone cv353? please advise. Thanks
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You may have a stuck relay or one of your access port switches may be bad. According to the owners manual: "A complete check of all Wall Inlet and Power Unit low voltage control lead connections (external yellow leads). Turn system off by removing fuse or tripping circuit breaker at house fuse box."
Check the filter. If it's dirty, thoroughly rinse it in cool water, then let it thoroughly dry before using. If you don't have an extra filter to use during this time, you should get one.
It could also be a clogged hose or pipe. These would cause the motor to overheat, thus shutting off. Check hose at end for suction. If weak or nonexistent, detach hose and try dropping a penny or dime, or marble, down the hose. If it comes out the end, the hose is probably clear. If this is the case, you need to check other outlets.
Try to plug the hose in sideways. So the top of the hose is rotated 90 degrees. If the unit turns on then there is something wrong with the hose. It might be a short or it could be a bad switch on the handle. If the unit still wont turn on I would think that maybe the low voltage wire got disconnected from the unit or there is a break in the low voltage wire somewhere along the way. Let me know if you plugging the hose in sideways works.
most of those systems are plumbed with PVC, but some do use flex throughout the home...
If yours is PVC, visit your nutone dealer and get a new outlet/elbow.
Trim the old elbow off with a drywall saw or other small saw (if you have a sawsall, that is fine) and glue the new one in
if it is flex tubing, it's easier; the elbow threads on. just be sure to hold the tubing so it doesn't drop down,
My guess would be that the motor is done. Impossible to diagnose for sure without seeing it of course. If you were happy with the unit before the trouble, a replacement motor will probably run $250-$300. If you are interested in a new unit, shop around. There are definitely better designed and more powerful units out there, although some of them can cost quite a bit more than $300. Good Luck!!
I think this unit has a utility valve on the front. If so, do you have good suction at this valve? If not, disconnect the inlet piping and check the suction directly from the inlet. Make sure the utility valve is closed while checking the suction on the inlet. If you have good suction, you have an open pipe or valve somewhere in the house. If you have any vacpans, check these first. Next, turn the unit on and walk through the house and listen for air whistling. If you do not have good suction from the inlet at the unit with the utility valve closed, replace your bag and look for a secondary filter that may be plugged. Good Luck!