I'm in Colorado where the humidity is very low (most of the time).
However, when we have a rainy spell and the humidity soars, I have
one flourescent ceiling light which won't turn on. (Once in a while it
will light up, but mostly it won't.)
It's not the wall switch. I've tried other switches.
It's got to have something to do with the humidity.
DH in Denver
Generally it is the result of a contact(s) that are not making good
connections. Look for the ground wire and the sockets that sometimes
corrode a little. Try removing and replacing the lamps. It that fixes it
and if the problem returns consider replacing the sockets or fixture. I
find that once a socket starts giving a problem, the problem keeps coming
back until it is replaced.
Good ideas, and also good of Dave M. to suggest checking the grounding -
that is a common reason for fluorescents to have trouble starting.
Grounding affects the electric field distribution within a fluorescent
tube that is trying to start. Incorrect ballast connections, such as
switching hot and neutral, sometimes also affects this.
Another thing to try - cleaning the tubes. A film of dirt/dust or
dried up perspiration on the tube may become conductive enough in high
humidity to screw up the electric field distribution within a tube that is
trying to start.
- Don Klipstein ( firstname.lastname@example.org)
All true, and if that fails, it's most certainly a
ballast (or starter if it's that type). Especially if
the ballast is humming and it didn't used to, it needs
replacement. Or, the whole ficture is sometimes just
as cheap ;-( and not a lot more trouble.
If you have a multimeter, pull out all the lamps and check that two pins
at each socket is getting a few volts on AC range. Make sure the
contacts are in good conditions as well. If they're corroded, the
sockets needs replacing.
If the lamps are dirty, wash them with Dawn and try again.
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