Question about Intermatic Malibu 300W Power Pack Transformer ML300RTW

1 Answer

Malibu Lighting ML300RTW Transformer Motor

I have a ML300RTW transformer that doesn't have enough force or strenght to turn off my lights. I wonder if there is a Potentiometer were I can increse the current going to the little motor. The motor works fine, and the time rotor keeps moving, but when the actuator reaches the swith pole, it gets stuck there and doesn't turn the system off.

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  • Luciano Pedroza Nov 05, 2012

    Good morning/Thanks,

  • Luciano Pedroza Nov 05, 2012

    Thanks you much. I already soved my problem. It's true, the motor is loosing It's strenght, So I opened the switch which is activated by the litte gear motor. Y cleaned it, lubricated it and decrease the tension on the contacts to mke the switch lighter. Now my lights turn on and off. Thanks to all and have a great time.

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  • Intermatic Master
  • 5,089 Answers

Motor has gotten weak, and is overheating and soon will not work.
Some people report taking apart motor and cleaning gears.
Others report that they didn't record how the gears came off, and can not reassemble.
PB912M10 Clock module is not sold separately.

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

Posted on Nov 05, 2012

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Posted on Jan 02, 2017

  • 4088 Answers

SOURCE: One year outdoor lighting (300V #135708) Transformer not working

You need to disconnect the lighting load completely from the transformer and check it's output. If it is dead unloaded, replace the transformer. If it seems to work now, then some part of the lighting circuit has probably shorted out. If there are several circuits coming to the transformer, attach each one separately and recheck for power. When one is attached that kills the output, investigate that circuit. Check for any broken lamps first, then the wiring must be opened at each lamp location to check for a local short circuit. A somewhat tedious fix. Hope this helps!

Posted on May 24, 2010

  • 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

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

SOURCE: I have a Malibu 300

I don't know any site selling power pack gears.
Maybe ebay has gears or sells used power pack.

Easiest thing might be buy cheap plug-in timer, set power pack to override, and plug power pack into cheap timer.

Intermatic does not sell the timer module separately, or the gears.
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

Posted on Aug 13, 2011

  • 5089 Answers

SOURCE: Malibu transformer ml44p doesn't turn off

Check if trippers are worn.
Check if dial rotates and keeps good time.
Plug transformer into cheap wall timer.

Copy following link for trippers, 5-year warranty info, tips to make power pack last longer, and other troubleshoot resources:
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

Posted on Oct 31, 2012

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I have a Malibu 300 watt ML300rtw transformer for outside lighting. The timer stopped moving and when I took it apart the small plastic gear was worn down and it was not turning the timer. Is there...


I don't know any site selling power pack gears.
Maybe ebay has gears or sells used power pack.

Easiest thing might be buy cheap plug-in timer, set power pack to override, and plug power pack into cheap timer.

Intermatic does not sell the timer module separately, or the gears.
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

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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.

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You need to disconnect the lighting load completely from the transformer and check it's output. If it is dead unloaded, replace the transformer. If it seems to work now, then some part of the lighting circuit has probably shorted out. If there are several circuits coming to the transformer, attach each one separately and recheck for power. When one is attached that kills the output, investigate that circuit. Check for any broken lamps first, then the wiring must be opened at each lamp location to check for a local short circuit. A somewhat tedious fix. Hope this helps!

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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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