Question about Intermatic Malibu 121W Power Pack Transformer ML121RT

1 Answer

I have a malibu ML121RT timer that just stopped working. Outlet works, new lightbulbs, didn't nick power cords to outdoor lights. What could be the problem?

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1 Answer

The PB912M10 timer clock motor is not sold separately. Aug 2010.
If power pack transformer still works: buy cheap plug-in timer, set power pack to override, and plug power pack into cheap timer.
If transformer no longer works, then it is not repairable.
With receipt, power pack might still be under warranty.
Open following link for power pack tips and resources:
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

Posted on Aug 23, 2011

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1 Answer

I have (7) 20W bulbs on a newly wired line running on a brand new 200W Malibu transformer, worked fine for 2 days and now it's tripping the reset button - Any suggestions ??


1) Copy following link for malibu power pack tips for longer transformer life:
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

2) Two plug choices on each outlet, Plug power pack into other outlet on receptacle.
Inspect for damage on outdoor outlet.
Replace outdoor outlet, and do not use quick connects. Connect wire directly to screws on side of device.
Replace GFCI outlet.

Feb 01, 2013 | Malibu Intermatic Inc. ML121RT Low...

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.
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

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

1 Answer

Where is the manual on/off switch on the malibu ML121Rt?


Intermatic site is closed this weekend.
Open following link to download ML121RT instructions.
Word search instruction sheet for 'manual'
http://www.intermatic.com/products/professional lighting/light expressions/power packs.aspx

For information on Intermatic/Malibu power packs showing links to manuals, 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.

Apr 02, 2011 | Malibu Intermatic Inc. ML121RT Low...

1 Answer

Need to reset my ml121rt timer. How do i do it. don't hav the instruction manual


1) Manuals appear on following two links:
http://malibulights.com/customer_service/owners_manuals.aspx

http://www.intermatic.com/products/professional%20lighting/light%20expressions/power%20packs.aspx

http://www.intermatic.com/~/media/files/intermatic/products/instructions/professional%20lighting/ml121rt%20trilingual.ashx

2) 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 for more free help.
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.

Mar 05, 2011 | Malibu Intermatic Inc. ML121RT Low...

1 Answer

Where is the reset breaker located on the ml121rt? Lights have been tested and work with an alternate transformer but noting using terminals a & b on the ml121rt.


ML121 does not have reset.
If transformer does not produce 12 volts across terminals A and B, then power pack has gone bad.

If override still works, then might be easiest to buy cheap plug-in timer, set power pack to override, and then plug power pack into cheap timer.

With receipt, power pack might still be under warranty.

Open following link for power pack resources, and links:
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

Jun 05, 2010 | Intermatic Malibu 121W Power Pack...

1 Answer

What timer motor fits in Intermatic ML121RT Power Pack ?


The PB912M10 timer clock motor is not sold separately. Aug 2010.
If power pack transformer still works: buy cheap plug-in timer, set power pack to override, and plug power pack into cheap timer.
With receipt, power pack might still be under warranty.
Open following link for power pack tips and resources:
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

Apr 11, 2009 | Intermatic Malibu 121W Power Pack...

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