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Old 04-24-2010, 04:47 PM   #1
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pot light - can light troubles


ok, so I have 4 potlights in a vanity above my bathroom sink. They are tempermental and seem to go out frequently. I don't think it is a problem of them heating up as they can go out right away or after an hour. I have replaced the switch and tightened all the connections, anybody have an idea of what the problem might be?
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Old 04-24-2010, 05:42 PM   #2
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I have replaced the switch and tightened all the connections, anybody have an idea of what the problem might be?
The only things left are bad bulbs, bad sockets, bad interconnecting wire. This last possibility is really remote.
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Old 04-24-2010, 08:42 PM   #3
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All cans have a thermal overload switch--If the cans get to hot they turn off.

Common causes--bulb to big----wrong trim ring (to tight to let air into can)---Glass cover---

Insulation to close to can.(or to tight to a joist )

Do the go off and turn on again after they cool off?----Mike---
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Old 04-25-2010, 10:04 AM   #4
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there are four of them and they all go off together. I thought about the overheating however sometimes they go off after a minute (could they heat up so fast?) and other times it takes an hour. They come back on, sometimes after just flicking the switch or sometimes on their own, and it takes different amounts of time for them to come back on too.
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Old 04-25-2010, 10:24 AM   #5
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there are four of them and they all go off together.
So the problem is upstream of this connection.
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Old 04-25-2010, 05:28 PM   #6
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Couple more questions---

Are the low voltage? Transformer may be over heating and shutting down--the transformers do go bad after a while.

Is it on a dimmer switch? They are known to go bad--Try changing your switch--

--Mike--
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Old 04-26-2010, 12:57 AM   #7
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So the problem is upstream of this connection.

Agreed.
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Old 04-26-2010, 10:01 AM   #8
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You can flush out this bad connection by substituting a hair dryer for the four bulbs.
This heavy load may cause the bad connection to go to 'open' and stay there, but that problem is easier to troubleshoot than an intermittent.
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Old 04-26-2010, 08:17 PM   #9
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35w - 12volt, I really don't know much about electrical, I take it the transformer knocks it down to 12v? I wonder if I should just replace the transformer?

It's not a dimmer, just a regular switch, and that was the first thing I replaced when all this started happening. All the connections have been tightened.

Thanks for everyones replies
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Old 04-26-2010, 10:13 PM   #10
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35w - 12volt, I really don't know much about electrical, I take it the transformer knocks it down to 12v? I wonder if I should just replace the transformer?
If it's an electronic t'former that's a good candidate for all this difficulty.
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Old 04-27-2010, 11:24 AM   #11
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how do I know if it is electronic? all I see is small black box
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Old 04-28-2010, 09:46 AM   #12
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how do I know if it is electronic? all I see is small black box
A magnetic 'former for 35w would take up a little less than 9 cu. in. An elec. 'former would be significantly smaller.

Last edited by Yoyizit; 04-28-2010 at 10:32 AM.
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