Question about Intermatic Malibu 121W Power Pack Transformer ML121RT

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Malibu transformer ml44p doesn't turn off

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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:

Posted on Oct 31, 2012


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Malibu Lighting ML300RTW Transformer Motor

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.

Nov 04, 2012 | Intermatic Malibu 300W Power Pack...

1 Answer

Have an Intermatic/Malibu ML600TW. Need to replace the terminal blocks where the transformer wires join the lighting wires. New ones from Intrermatic are wrong size. They say that's all they'

First time I've heard of this problem... and since Intermatic doesn't have exact part, I would guess the problem is not common.
Usually the trippers wear out or timer module stops or transformer burns out after power outage or bulbs burn out and are left unchanged so transformer overheats and quietly stops working.

1) Suggest use gorilla glue and stick the thing back together in that manner.
2) If the wires from transformer are connected to terminals, then you can use the flimsy plastic and glue it into place.
3) Post a photo on internet and send link so expert can see what you have.
4) Of if product is still under the 5-year warranty period, then send back to Intermatic and let them fix the product.

Copy following link for product resources.

Sep 27, 2012 | Malibu ML600TW - Low Voltage Power Pack -...

2 Answers

Problem with Malibu Landscape Lights Transformer ML900TW

Use an extension cord to plug the transformer into a different "test" GFCI receptacle, if it holds on the test GFCI you know that the GFCI for the transformer needs replaced. If it doesn't hold, then the transformer is on the way out and should be replaced. Sometimes motors and transformers will "leak" current and still work, but not trip a regular circuit breaker. A GFCI that is doing it's job will catch it though. Don't force a GFCI like can wear it out prematurely.

Apr 24, 2012 | Home

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Describe your Malibu 121W Power Pack Transformer ML121RT Problem my unit just fryed itself as I had a underwater light hooked up to it. however it took 3 years for this to happen plus I think I had more...

Power pack wattage has to match bulb wattage, or it shortens life of power pack.
I don't know physics and electrical engineering enough to know why this happens.
Also when working on bulbs, manual says to unplug power pack so it doesn't burn up.
If bulb is under water that's fine, but wiring cannot be underwater where it shorts out, or suspect this action might also shorten life of power pack.
With receipt, power pack could still be under warranty.

Open following link for power pack resources, and links:

Aug 23, 2011 | Intermatic Malibu 121W Power Pack...

1 Answer

I put in a new 200 w Malibu LV. It worked one day, then only one light would work. The next day it worked again on all lights then it went back to lighting only one. I'm using a combination of 12 LV...

I don't have repair for defective transformer.
The transformer puts power on the wire. Buy multimeter and check voltage across the terminals.
If wires are loose, or bulbs are not connected to wire, or bulbs burned out, or if wattage of bulbs is mis-matched with transformer wattage, then lights might not work as expected.

Aug 16, 2011 | Intermatic & Malibu& 300 Watt Power/Pack...

1 Answer

I bought a Malibu 300W low voltage landscape transformer to replace a 200W unit that stopped working. It worked for 1 week, then stopped .. the reset **** doen't work. The LED works, I do see a...

I don't know if it burned out, but something is not right.
Malibu products come with 1-5 year warranty.
New product that stopped working should be exchanged for full replacement at place of purchase, except possibly the auction sites.
New Malibu product should work for many years.
Be sure to match bulb voltage with transformer voltage to avoid possible problems.
Mismatched bulb and transformer wattage should not affect a timer in short period such as 1 week.
Another thing to check is outlet polarity. Use circuit analyzer from home center to check outlet.

Jul 20, 2011 | Intermatic Malibu 300W Power Pack...

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