Faulty 12v Transformer? - Electrical - DIY Chatroom Home Improvement Forum
Advertisement


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools
Display Modes
Old 01-21-2010, 11:03 AM   #1
 
Join Date: Jan 2010
Posts: 3
Rewards Points: 10
Default

Faulty 12v transformer?


Can someone please advise - I have 3 35W dichroic lamps in my bathroom, which, for no apparent reason, just turn off, (usually when I'm sat on the throne!). Then, after a few minutes, they'll come back on again. And this carries on as long as the light switch is on. I suspect that the transformer is on its way out - has anyone had similar symptoms, or can anyone confirm this? The existing transformer is rated to 150W, which I thought would be ample for 3 35W bulbs (105W).

Thanks
nosyparker is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 01-21-2010, 11:12 AM   #2
Member
 
Join Date: Sep 2008
Location: Oregon
Posts: 1,497
Rewards Points: 500
Default


Some light fixtures have a "heat sensing" device and this will turn off the power to the lamps if it gets to be too hot.

Might try directing a fan at the lights/transformer and see if that keeps the lights on longer. If yes, then it is a heat problem.

Or try removing one bulb. See if it stays on then.
Billy_Bob is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 01-21-2010, 01:03 PM   #3
 
Join Date: Jan 2010
Posts: 3
Rewards Points: 10
Default


Thanks, Billy Bob. If the lights stay on with one removed, does this still point to the transformer? I've also noticed that the transformer is covered with roof insulation so I'll make a breathing space for it. But then again, it's been covered for the past 10 years without any problems until now! I'll let you know how I get on next week. Thanks again.
nosyparker is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 01-21-2010, 09:00 PM   #4
Idiot Emeritus
 
Join Date: Mar 2008
Location: Fernley, Nevada (near Reno)
Posts: 1,910
Rewards Points: 80
Default


The problem will very likely be solved by removing the insulation from around the transformer. They need air around them to cool.

Most of them have built-in thermal cut-offs, if they can't cool, they'll cycle just like you described.

Rob
micromind is offline   Reply With Quote
Old 01-28-2010, 10:26 AM   #5
 
Join Date: Jan 2010
Posts: 3
Rewards Points: 10
Default

Faulty 12v transformer


OK thanks - I changed the transformer and everything works fine, now. Why do they make roof spaces so difficult to work in? Thanks again
nosyparker is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
transformer questions Steelhead Electrical 8 10-25-2009 08:39 PM
How to install Aprilaire transformer? Studly HVAC 9 09-18-2009 09:44 AM
Comfortmaker RPJ - Bad Transformer? olgranddad HVAC 2 12-26-2008 11:10 AM
Central Ac transformer question Rschrei518 HVAC 4 10-20-2008 08:21 PM
Different color wires on new doorbell transformer.... ConstantChange Electrical 31 11-21-2007 11:08 PM




Top of Page | View New Posts