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Trouble with a circuit, old house

Posted by krdunnam (My Page) on
Thu, Mar 25, 10 at 11:14

Circuit feeds upstairs to two ceiling fan/lights and two wall outlets. One of the fans was installed brand new last August, and everything worked fine at that time...until about December.

No power all winter. I have noticed some correlation to the outside temps (it seems to be coming back in late afternoon. I'm in Michigan.)

The handy guy who installed the newer fan/light was just here with his circuit tester. We flipped the previously-identified breaker. Per the tester, still had power to the outlets and fans, but nothing actually worked.

House was built in 1890 (original gas light pipe still in some places, some knob & tube remains) and has had many gradual upgrades.

I've skimmed the forums. There are no GFCIs on this line, and no dimmer switches.

Any suggestions? Thanks.

Follow-Up Postings:

RE: Trouble with a circuit, old house

When you say you "flipped" the breaker, I presume you mean you turned it off. What kind of tester was your handy guy using? Non-contact voltage testers (sometimes called a "volt tic") and digital multimeters can give erroneous readings in some situations. Also when testing a circuit with a multimeter or solenoid type tester it's important to test from hot to neutral and hot to a known good ground. No power from hot to neutral but power from hot to ground would indicate a bad neutral.

You might be best served by hiring a licensed electrician with experience in older residential wiring. With the age of the house and assorted wiring methods in use, this might be a difficult problem to troubleshoot that will require someone with experience in older wiring methods.

RE: Trouble with a circuit, old house

While you are measuring the voltage add a load.

RE: Trouble with a circuit, old house

Old house wiring can be tricky. I remember reading years ago about a case where an old house's cellar light worked in the winter but not in the summer (the opposite of your problem, I know, but this is really just for the information and entertainment value).

It turned out that the electrician who'd installed the original knob and tube had missed soldering a splice. When the copper wire contracted in cold weather, it pulled the splice together enough to make the light work. In warm weather the wire expanded and sagged a bit; the splice loosened up and the light wouldn't come on.

Not saying this is your problem, just that troubleshooting old houses can be an interesting challenge. Sometimes an old-timer can be helpful for these cases.

RE: Trouble with a circuit, old house

That sort of thing IS possible.

I'm thinking there's some sort of automatic sensor or otherwise, probably related to the heating/cooling systems, that has been miswired.

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