Question about Malibu ML300RTW - Low Voltage Power Pack -300 Watt - With Timer and Ground

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Malibu 300RTW- Timer will NOT trip "ON" but will trip "OFF"

Malibu 300RTW - Timer mechanism will NOT trip lights "ON" - need to manually turn lights on by rotating dial at timer box. But, timer WILL trip lights "OFF" in morning; (so the timer is timing). Tried everything but take the timer apart. Since the "ON" position needs a "stronger dial turn to Trip" is there a replacement part or simple solution other than bying a new timer. Thnx

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Posted on Jan 02, 2017

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SOURCE: ML 300RTW

First test your ac voltage going into the transformer. Then with the lights disconencted check the voltage at the terminals. (make sure your tester reads 12V DC) If you have voltage now, then you most likly have an open circuit or a short in your lighting wiring, or fixture socket.
http://www.malibulights.com/Docs/Pdf/8100-9300-01.pdf

Posted on Jul 19, 2010

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I have a Malibu 300 watt ML300rtw, timer goes until it reaches "on" pin then stops. if i manually turn timer, i hear click and lights go on - they turn off no problem. pins are not broken. what next?


Sounds like the mechanical timer assembly likely has never been lubricated, You may use a lightweight oil, such as WD-40, to lubricate the timer mechanism.

May 09, 2015 | Malibu ML300RTW - Low Voltage Power Pack...

1 Answer

Where can I order some replacement ML Power Pack trippers for a ML600TW and ML 300RTW timer?


1) Copy following link for ML series trippers, troubleshoot, 5-year warranty info, and tips to keep power pack running longer.
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

2) Add comment if more help is needed. Jan 2013.

Jan 18, 2013 | Intermatic Inc. ML121RT Malibu Low Voltage...

1 Answer

I have a ML44T automatic timer for my outdoor lights which has been working perfectly until now. When the time turns until it gets to the point where it has to trip the switch to turn the lights on it...


The clock motor has gone bad.
There are no replacement clock motors.
To work around, buy cheap plug-in timer, set power pack to override and plug power pack into cheap timer.
Power packs have 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

Mar 08, 2011 | Intermatic ML44T TRANSFRMR WITH TIMER 44...

1 Answer

I have the same above T104 Mechanical Time Switch. It is hooked up to our outside lights. The timer will turn on the lights at the proper time. The timer properly turns off the timer at the turn off time....


If i understand correctly, you have T104 240V timer that has worked fine in the past.
If this is true, then breaker is correct size.

If this is new installation, then check wiring at timer, and then add up total watts of Load and divide by 240 to check if breaker is sized correctly
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html
http://waterheatertimer.org/B220C.html

If timer worked fine in the past: It seems you have a short somewhere, which is puzzling why it trips when when timer turns OFF.
And the short could be inside a bad breaker -or- inside the timer -or- possibly a wire.
Move wires from 240Breaker to another same-size 240V breaker and see if problem persists.

After moving wires to another breaker, use manual override to check if suspect is the breaker or possibly a short in the timer.
Absolutely stand on dry surface or dry boards when working on this timer, to be on safe side.
Manual override should switch Load on-off, and override should snap clean and crisp each time.
If manual override lever is not crisp, then that signals timer has gone bad.

Also snap mechanism out of box using thumb-spring at top of box, and look for signs of burning and high heat, especially at contacts.

If you buy new timer, the inside mechanism can be swapped out without changing the box.

Add a comment and let me know what you find out, and I will respond if needed.
This is interesting puzzle.

Feb 03, 2011 | Intermatic T104 24h 208-277v Mechanical...

1 Answer

Timer will not tirun on the lights, it stops when it gets to the time to turn on.


Malibu home page
Malibu manuals

Try the manual override >>> un-plug power pack and try loosening manual override with WD-40

It sounds like the clock motor is unable to push the manual override
Don't continue to run power pack or the clock motor will burn up or break a plastic gear

If manual override will not work, or clock will not trip on lights, you need a new power pack
Power pack size chart and wire length

Be sure to buy same wattage power pack as you have
The 300 Watt unit is made for 15 - 20watt bulbs (15 x 20 = 300)
If you buy 600 Watt power pack and hook it up to 10 - 20 watt bulbs, it will burn out the bulbs
Manual also says to replace burned out bulbs ASAP or other bulbs will burn out.

Oct 09, 2010 | Malibu Intermatic Inc. ML300RTW 300-Watt...

1 Answer

ML 300RTW


First test your ac voltage going into the transformer. Then with the lights disconencted check the voltage at the terminals. (make sure your tester reads 12V DC) If you have voltage now, then you most likly have an open circuit or a short in your lighting wiring, or fixture socket.
http://www.malibulights.com/Docs/Pdf/8100-9300-01.pdf

Jul 19, 2010 | Malibu Intermatic Inc. ML300RTW 300-Watt...

1 Answer

Timer stops at on and off trips and doesn't turn on or off


The clock motor has gotten weak and now it is overheating and will not recover.
There are no replacement clock motors.
To buy more time with old power pack, purchase cheap plug-in timer, set power pack to override, and then plug power pack into cheap timer.

For more information on power packs showing replacement trippers, useful links and tips
http://www.fixya.com/support/r8391011-power_pack_not_working

Jun 23, 2010 | Intermatic Malibu 300W Power Pack...

3 Answers

Timer stops at on postion? transfomer works, have to do it by hand


If the timer is stopping, it could be a physical obstruction. Or it could be an electrical mis wiring so that the timer is turning itself off at that point, check the incoming wiring and see if it makes sense, and follow the diagram to see if the incoming power is definitely not on any switched terminals, they would maybe be marked with NO , NC,

May 04, 2010 | Intermatic Malibu 300W Power Pack...

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