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I have your 300W transformer. Hooked up about 100W's worth of low volt light fixtures. It worked the first night for about an hour then went off. Tried plugging it in again and they came on for

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1) Most low voltage transformers have warranty, but with some brands, the warranty carrier is unknown:

2) Fixya does not sell transformers.

3) Add comment and clearly describe product, or give product number so timer expert can understand which troubleshoot steps to offer.

Posted on Jan 02, 2013

  • Gail Huber Jan 02, 2013

    Sorry, it is a Hampton Bay from Home Depot. I had bought a 200W one also, so I hoooked it up today and so far so good. I will return the bad one tomorrow.

  • Gene Haynes Jan 03, 2013

    Yep, buy local, and return local is best way to handle warranty!



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Posted on Jan 02, 2017

  • 691 Answers

SOURCE: I just bought a new Malibu Landscape Lighting 200

working with those outdoors transformer I have ran into couple would short the unit out by installing it wrong or exposing to lots of waters/moister. Again, it could also be a factory fault unit, some products will only last only few days before it blow out. It happen and most of those unit have 5 years warranty on them. I would take it back and get another and if it happens again than you may not installing it correctly or installing too close exposing to lots of moister and may short the unit out. I don't recommend trying to fix it still having warranty on them, get a replacement and start over. good luck and i hope that help some

Posted on Jul 10, 2009

  • 1865 Answers

SOURCE: 600 low voltage transformer hook up to 3 outside pedestal lights

bulbs or wiring

Posted on Aug 18, 2009

SOURCE: Hello! I have a Malibu transformer

Malibu website
>knowledge base search is located top right corner of website
> I serched knowledge-base for 'lights not working' >>> came back with thin results
> Evidently Malibu doesn't have knowledge of lights not working

Here's simple test: Leave unit plugged in. Remove wires from unit. Use On-off dial to turn ON system. Use wire to scratch across terminals where wires connect >> do you see any sparking that would indicate voltage is present? if voltage is present, your lights may be burned out from last night's power surge ... or those pesky contacts that connect light to the main wire need to be re-done. More info on burned out lights below

another clue: is malibu box warm when you touch it? Transformers get warm because 120V continually runs through a coil ... and the magnetic field from the first coil creates lower voltage in another coil. Same as your phone charger. Transformer runs 24-7. The timer does not turn off the transformer, it just switches off the main wire going to lights

If transformer is warm, it says that power is available. That would narrow problem down to timer mechanism. You might try turning malibu upside down for a couple days in dry environment and see if that revives the unit.

If transformer does not feel warm, then transformer is probably burned out. Electrical devices go bad, especially when exposed to weather.

Malibu manual has some troubleshooting steps located below step 8.

-You checked electric supply.
-Turn on-off dial to ON to see if override works

-Troubleshooting mentions power conditions/ voltage conditions ... which I assume would include power surge ... it doesn't say specifically that this causes transformer failure .. but it points to bulb failure.
-Troubleshooting mentions burned out lights ... I think they are saying that once a light burns out, that voltage is increased to other lights and burns them out too

Transformers don't have a reset button.

Posted on Oct 07, 2010

SOURCE: Aquaman987 - Tonight I hid the photocell between

1) If this is new installation: Check wiring.
Black to Hot from breaker.
White to Neutral from breaker box.
Red to Load (light)

Neutral wire is necessary to operate photoeye.

2) If installation worked at one time but doesn't work now, then photocell is bad.
Or if photocell is new, they arrive defective sometimes.
Proof is your black-tape test.
Buy new photocell from Home Center electric department, or lighting department and connect wiring as described above.

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on circuit or any do-it-yourself project.
Fixya is always less expensive than a service call.

Posted on Jan 27, 2011

SOURCE: 290 W worth of fixtures on 300 W transformer. To

Your photo eye is getting feedback from lights.
Shield photo eye from light so it doesn't click on-off

Open following link for more Power Pack information:

Add a comment for more free help.
Also take advantage of fixya expert assistance live.
For a price, expert works with you via e-mail while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

Posted on Feb 22, 2011

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We have a lutron nova 2003p (1600 watt) switch supplying power to a line of 18 12 volt, 50 watt lamps. switch went out. is this caused by over-amperage draw?

Hi John, I'm an electrician and I think I can help you with this problem.

First and foremost, this switch's 2000VA / 1600W electrical rating is based on a incandescent load.

Let's do do the math on this one.. 18 x 50 = 900 watts. So, you're under the 1600 watt capacity, but I think this is a bit more involved than this.

I'd be willing to bet that you're not dimming a 12 volt circuit - but rather a 120 volt circuit that supplies one or more transformers that step the power down from 120 volts to the the 12 volt bulb voltage. A transformer is an inductive load. A transformer's inductive load is completely different than the incandescent load the dimmer is designed to control. The transformers are rated for 120 volts and will have issues including heat problems if provided less than the rated input voltage to provide a reduced output voltage you want so that you can dim these lights.

This switch will not work on the output of the transformer in this situation either because the significant amperage being switched here. Each of these lamps draws a bit over 4 amps as determined by ohm's law: 50W / 12V = 4.16A. The total load at 12 volts is (again, Ohm's law) 18 x 4.16A = 74.88A ! That means the wire would need to be a #4 or #2. This is about the size of the cable on your car's battery (only amperage determines conductor size - voltage determines insulation).

A dimmer on this circuit will not work unless the fixtures are changed so that no transformers are used to supply the lamps. This includes fluorescent lamps (compact or otherwise) unless the packaging specifically states that they can be used on a dimmer.

You may wish to contact Lutron Hotline at 800-523-9466 for additional help and suggestions. I hope this helps & good luck!

Mar 29, 2012 | Lutron Electrical Supplies

1 Answer

290 W worth of fixtures on 300 W transformer. To obtain even current at all fixtures a wire loop is used. However Photocell caused Transformer to run hot and cause lights to come on and then off at 2 to...

Your photo eye is getting feedback from lights.
Shield photo eye from light so it doesn't click on-off

Open following link for more Power Pack information:

Add a comment for more free help.
Also take advantage of fixya expert assistance live.
For a price, expert works with you via e-mail while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

Jan 26, 2011 | Intermatic Malibu 300W Power Pack...

1 Answer

Fluorescent lights will not come on. There is power to the ballest.

Power to the ballast is good. The power you checked is known as the primary power. The secondary power from the ballast (transformer), should be around 600 volts. This 600 volts is what vaporizes the gas in the fluorescent lamp. Go to home depot and buy a magnetic field tester (we call it a thumper) It has a shirt pocket clip on it. Do not insert the thumper in the fixture lamp sockets, just put it in front of one of the light fixture sockets. It should beep and the light on the magnetic field tester (thumper) should come on if you have a magnetic field in the light fixture socket. This means that the light fixture ballast secondary is working. No beep and no light from the magnetic field tester (thumper) means your ballast is bad. Ballast are dangerous to replace. Have an electrician replace it. Your life is not worth losing over saving a few dollars.

Jan 06, 2011 | Lithonia Lighting White Finish 48" Wide...

1 Answer

Lights come on for about 2 min.and shut off. I turn off transformer for about 15 mins and turn on lights work for about 2 mins.

Unless you have the optional photo cell, I'd imagine you are overloading the transformer. Total up your lamp wattage and be sure it is less than the 300W rating of the transformer. The lights usually range from 10 to 50 watts, so you could have 30-10watt lamps or 6-50 watt lamps. The other possibility is that you have a short in your wiring or fixture. In either case if you overload the transformer it should cycle off to protect from overheating, and when it cools, it will restart. Try connecting just one luminaire to the transformer and see if it works. See link:

Jul 03, 2010 | Intermatic Malibu 300W Power Pack...

1 Answer

I replaced my thermostat last night without

check for 24 volts ac at R & C terminals at the t-stat. Your transformer will have 4 wires hooked up to it. Two on one side and two on the other. Two of them will read either 120v or 240 v ac depending on whether you have a 120 or 240 v voltage. The other side should read 24 volts. If you are not reading 24 volts, then you have burnt the transformer and will need to replace it. If you are reading 24 volts, check to see if there a low voltage fuse located on the control circuit board or somewhere between the transformer and "R" terminal.
Here's a picture of a typical low voltage transformer found in an A/C system:

If you replace the transformer, add a 5 amp fuse on one of the 24 volt leads......this will save you from having to replace another transformer in the event of future "short" in the low voltage circuit.
Contact me with any questions or concerns.

I hope you find this to be very helpful to you moving forward,

Please leave a rating. :-)f0b3aee.jpg

May 09, 2010 | Heating & Cooling

1 Answer

I have a 300 watt Malibu transformer to run 4 step lights on a patio. the wires from the step lights go through conduit under patio and all come out under some steps at the house. So I have 4 sets of wires...

Take one cable to the x-former to the 4 sets, then Splice all the wires (5 in one nut and 5 in the other) together. Then connect the one set at the x-former. Don't worry too much about the 10 ft issue. It will work fine.

Jul 05, 2009 | Intermatic Malibu 300W Power Pack...

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