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Lights not coming on on unit, tho clock is operating. Model #ML0121T transformer. 121 watt unit on manual operation.

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Posted on Jan 02, 2017

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There is a manual for your purifier at this website.
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Posted on Feb 25, 2008

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SOURCE: ML 121 RT doesn't power all lights on the system

Go back to where the lights are working, Then inspect the cable leaving that point. You must have a bad spot somewhere after that point killing the voltage.

If you need further help, I’m available over the phone at

Posted on Jun 27, 2009

  • 8 Answers

SOURCE: lost operating manual. is the temperature light

No it should not be blinking

Posted on Jul 11, 2009

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SOURCE: Blown Transformer heat pump

blown transformers are usually from a low voltage short the first thing i would do is wire a automotive or resetable 3amp fuse in line with the transformer so you dont blow transformer after transformer the wire coming off the transformer that say 24v take that wire a couple of inches down and cut it and install the fuse in series there

now you can go through your low voltage wires one by one and test them unhook all the wires to your outdoor condenser at your indoor unit(furnace or airhandler) and try turning it to cool now if you blow the fuse the short is between the tstat and the indoor unit if the fuse is still good leave it on cool and hook up one wire at a time to your outdoor unit starting with R a lot of times your contactor or your defrost board will short out on you also look for pinches in wires wires with cracks in the insulation and wires touching metal this situation can be a real pain sometimes i would recommend calling a hvac company if you start to get stumped
hope this will help you

Posted on Jul 26, 2009

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SOURCE: TDC low voltage transformer model DA 150 12 W reset button trips

There is a short circuit.
Copy following link to identify possible problem and download manual

If you need further help, I’m available over the phone at

Posted on Jul 17, 2012

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1 Answer

Does Malibu still make a model number ML500TW timer transformer

Intermatic/ Malibu series lights are available 44 watt, 88 watt, 100 watt, 121 watt, 200 watt, 300 watt, 600 watt, 900 watt.

None of the other brands sells 500 watt either.
Kichler sells 300 and 600 and 900Watts
Paradise does not have 500 watt
Malibu brand does not carry 500 watt
Portfolio does not carry 500 watt

If you need further help, I’m available over the phone at

Apr 16, 2013 | Hardware & Accessories

1 Answer

I have a malibu set of 8 lights about 80 foot of 12 gauge wire. They come on then after about an hour they shut off then come back on about 20 min later

Do you have photo-eye connected to the transformer?
Disconnect photoeye, or cover photoeye with black tape and see what effect it has.
Plug another light into same outlet and see if it has same problem.
Run temporary extension cord to transformer and see if problem is same.
When the lights are off, does the transformer make humming sound.
Intermatic/malibu timers have 5 year warranty if you have sales receipt.
Copy following link for troubleshoot resources, trippers, operation tips, etc.

If you need further help, I’m available over the phone at

Aug 15, 2012 | Malibu Intermatic Inc. ML121RT Low...

1 Answer

I have a ML121RT Low Voltage 121-Watt Power Pack with Timer hooked up with three 20 watt lights attached - going north. I want to add one more 20w llight going south. Can I attach an additional wire to...

Try it... should work
However minimum load for ML121 is 80% load rating.. so 80 watts is ok for 100 watt transformer... 60 watts is low and can cause early failure of transformer.

If you need further help, I’m available over the phone at

Jul 14, 2011 | Malibu Intermatic Inc. ML121RT Low...

1 Answer

My 600 watt 12 volt transformer timer for out door lighting does not keep time properly. HOw do I get and install a new timer?

1) Amazon sells 600Watt power pack:

2) I bought new 300Watt Malibu power pack at Home Depot about 2 months ago.
Near the lighting section.
My new power pack has electronic time clock, so no more 'slow clock.'
I think Home Depot had 600Watt.
Lowes carries different brand.

3) Manuals for power packs at Malibu

4) Tips for buying and taking care of power pack:
-Match up wattage of bulbs with wattage of power pack
-15 each X 20 watt bulbs = 300 watts, so install 300Watt power pack
-Installing a 500W power pack on 300W of bulbs will burn out bulbs and power pack.
-Replace bulbs as soon as they burn out or other bulbs will burn out and power pack will burn out.
-When working on bulbs, unplug power pack or it may burn out.

5) How to install power pack.
Before unplugging old power pack, check which bulbs are not working.
Replace bulbs using phillips screwdriver.
Unplug power pack.
Notice how wires are connected to power pack, write down terminal connections.
Some power packs have three terminals ... extra terminal is for additional photoelectric eye.
Use pliers or screwdriver to disconnect wires.
New power pack has has same terminals.
Plug in power pack.
Read instruction manual before connecting wires.
Save instruction manual because a few years that manual won't be around as products change.

Dec 03, 2010 | Malibu Intermatic Inc. ML121RT Low...

1 Answer

Power into unit ok power comming out of unit is very dim.

If you have a volt meter, check the voltage, I believe it is supposed to be 12 volts.
Are your bulbs the proper voltage rating, that is 12 volts.
Do you have enough bulbs connected to the transformer, connected load should be close to 121 watts when you add up all your bulb wattages.
Don't confuse volts with watts. The transformer reduces voltage to 12 volts, but the wattage of the transformer is 121 watts. Each bulb must be 12 volts but wattage (brightness) can vary depending on the fixture from maybe 7 watts to over 50 watts.

Dec 01, 2010 | Intermatic Malibu 121W Power Pack...

1 Answer

Where can I get the operating instructions for a Malibu Low Voltage Transformer, model ML88t?

Manuals for existing products
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I don't see your specific manual, but the operation might be similar to the ones shown here ... it could be that Malibu repeats the same instructions in different models

Oct 14, 2010 | Malibu Intermatic Inc. ML121RT Low...

2 Answers


I've done a lot of reading and research on Malibu

No replacement parts for Power pack, or schematic >> shows replacement lights and replacement power packs
Manual for Malibu 600 Watt power pack

SAVE the pins off old power pack and see if they match pins on new power pack ... because you can't find pins on the internet

When the power pack goes bad or you lose the pins, then you buy another power pack

Things to remember:
Match number of lights to power pack wattage
30 - 20 Watt bulbs => 30 x 20 = 600 Watt power pack
Replace bulbs as soon as they burn out, or other bulbs will burn out quickly, and I think it causes power pack to burn out sooner too.

Up-vote if this helped. Thanks for the feedback.

Oct 13, 2010 | Malibu Intermatic Inc. ML121RT Low...

1 Answer

L can manually operate the transformer but my clock does not work

Intermatic makes a PB913 timer module, but does not show PB912. Not even the old model page shows that timer.

Intermatic store does not show PB912

Open following for Power Pack troubleshoot and resources:

Upvote the help.
And 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.

Jul 22, 2010 | Malibu ML600TW - Low Voltage Power Pack -...

2 Answers

Malibu Light Transformer ML121RT troubleshooting

1) Disconnect the plug.
2) Remove the 3 hex screws holding the cover.
3) Make a note of all connections (taking a picture is even better).
4) Connect the black power wire to the red transformer wire.
5) Connect the white power wire to the white transformer wire.
6) Set your voltmeter to 20 or 50 volts AC (not DC and not less than 15 volts).
7) Plug the transformer in the wall.
8) Test the voltage coming from the A & B connectors at the back (polarity is irrelevant).
If you see 12 volts or thereabout, the problem is with the little switch (the one with the black and red wires that is activated by the trippers on the clock dial). I have the exact same problem but I have been unable to locate the part so I am going to try to clean the contact points and see if that works.

Jun 22, 2009 | Malibu Intermatic Inc. ML121RT Low...

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