Question about Intermatic Malibu 300W Power Pack Transformer ML300RTW

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Have Malibu ML300RTW Transformer...

For some reason, five landscape lights went out at same time. One flood light still is powering on. Tried changing the bulbs. Wiring is fine. Is it a problem with the box itself?

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Doesn't seem to me it could be the transformer/controller as it either puts out voltage and current or it doesn't. I can't think of any way it would selectively operate certain bulbs. You said wiring is fine, but you should check voltage at the end of the line to ensure it's getting close to 12 volts all the way down the wiring. If not, there may be a problem between transformer and misbehaving bulbs. Doesn't seem likely that 5 bulbs would go out a once, but that would be all that's left.

Posted on May 15, 2014

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Posted on Jan 02, 2017

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SOURCE: Malibu landscape transformer

I discovered that I hadn't turned the manual switch to off on the one that wasn't working properly.
Now they both work fine. The instructions that come with the Malibu Transformer is not easy to understand and it does not go into enough detail. There isn't a trouble shooting section which would help.

Posted on Apr 15, 2009

  • 1 Answer

SOURCE: Malibu transformer shuts down early

I'm thinking that a better brand is in order. Mine shorted out and started a fire. Luckily we had just returned from vacation and put it out with a hose.

Posted on Sep 05, 2010

gotgeek2
  • 565 Answers

SOURCE: I have a Malibu ML300RTW transformer with a 50 ft.

Usually 50 - 75 ft. is as far as you want to go, especially with 16 gauge wire. What happens is the lights get dimmer as the length of the run increases. If you don't mind the lights getting noticeably dimmer, go ahead and add the other 4 lights. Using a heavier (12 gauge) wire will help a lot. You'll want the 12 ga. to start at the transformer, preferably running the whole length. Also, using a smaller watt bulb will help.

If you have a 120 volt outlet near the approximate middle of the new (total 150 ft.) run, you could relocate the transformer to that location and have two 75 ft. runs in 2 directions.

Posted on Nov 29, 2010

Testimonial: "Thank you for your response. Your advise was exactly what I needed to know."

SOURCE: I have a ML300RTW Malibu

You can buy cheap plug-in timer, set power pack to override and then plug power pack into cheap timer.
Otherwise there are no repair parts for power packs other than on-off trippers.
Power packs come with 5 year limited warranty, so you are within warranty period. Good job saving the date of purchase, you outshine with that detail.

For more information on Intermatic/Malibu power packs showing troubleshoot steps, replacement trippers, useful links, warranties and tips:
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

Add a comment with your experience so others with same-similar problem can benefit.

Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

Posted on Apr 02, 2011

  • 5089 Answers

SOURCE: Intermatic Malibu ML300RTW Transformer Trips curcuit breaker when plugged in. Can I assume that the 4 year old transformer needs to be replaced?

Try the transformer on different outlet.
Move wires inside breaker box to different circuit breaker.
Check is breaker is loose, or makes crackling sound.
Copy following links for resources:
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html
http://waterheatertimer.org/pdf/How-to-find-ground-fault-in-household-electric-circuit.pdf

Posted on Jul 01, 2012

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1 Answer

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Try connecting a lamp (correct voltage, etc) directly to the transformer. Most likely, the wire from the transformer to your lights is broken... The reset button can't reset anything, if there's nothing wrong there.

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Switch power pack to override so lights are ON, and plug transformer into cheap wall timer.

Copy following link for tips to get power pack to last longer, troubleshoot, and warranty, etc.
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

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1 Answer

Malibu landscape lighting transformer problem


Testing ohms across A and B will read open circuit through transformer coil.
Testing DC voltage across terminals A and B should read 12 volts DC, and nothing less.
Transformer should make humming sound when working.
Test that receptacle has power and breaker is not tripped.

There are no repair parts for power packs, but they come with 5 year limited warranty.

For more information on Intermatic/Malibu power packs showing troubleshoot steps, replacement trippers, useful links, warranties and tips:
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

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1 Answer

Malibu landscape transformer


I discovered that I hadn't turned the manual switch to off on the one that wasn't working properly.
Now they both work fine. The instructions that come with the Malibu Transformer is not easy to understand and it does not go into enough detail. There isn't a trouble shooting section which would help.

Apr 14, 2009 | Intermatic Malibu 300W Power Pack...

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