Question about Vista Pro Digital 7-day Electronic Timer Dtc-170 Dtc170

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Timer is installed in a Vista mt-300 transformer in a residential installation, running 255 watts on the system. Lights worked fine last night, failed to work tonight. transformer has power (green light is on) but the red light (low voltage output indicator?) is off. timer is blank but it's receptacle has power. tried the reset button with no change (no surprise, no power). I am electrically challenged! P.S. timer is only 5-6 months old.

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Why won't my ml44t transformer turn the connected lights on or off?


1) Copy following link for installing and troubleshooting power pack
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

2) Test outlet for power.
Temporarily run extension cord from another outlet.
Connect wires to terminals a and b ... make sure no insulation is under screw plate.
44 watt power pack will operate 44 watts of low-voltage lights (12Volt).
If 300 watts of lights are installed on line, then lights probably will not light up.

Mar 01, 2013 | Hardware & Accessories

1 Answer

I have the 300 watt xformer. Lights worked fine for quite a while...now the lights come on and go instantly off, agai and again almost 'flickering" I am positive I have less than 300 watts on the...


Use manual override and see if lights work correctly.
Check that bulbs are each working. If one bulb is burned out, then others will burn out, and the load change can cause power pack to stop functioning.
Always unplug power pack when working on lights.

Power packs do not have repair parts anywhere on the internet that I know.
I checked Intermatic, Malibulights, ebay, amazon, and listened to fixya customers.
Occasionally folks take power pack apart, but nobody reports being able to repair the transformer or timer.

Once power pack goes bad, then it needs to be replaced. Bad news because they're expensive.

'Harry' wrote to fixya with some information.
His timer stopped working so he bought cheap plug-in timer, set power pack to override, and then plugged power pack into cheap timer.
Harry also said his power pack has 5 year warranty and he was negotiating with Malibulights.com for replacement. No word how that came out.

Best I found are tips for next power pack that might save money:
The reason I add tips now, before your power pack needs replacement is some fella wrote fixya.
He bought 500 Watt power pack to replace 300 Watt > thinking bigger was better.
Power pack burned out. Here's why:
a) Match wattage of bulbs with wattage of power pack
Lets say you have fifteen 20 watt bulbs = 300 watts, so install 300Watt power pack
b) Installing a 500W power pack on 300W of bulbs will burn out bulbs and power pack.
c) Replace bulbs as soon as they burn out or other bulbs will burn out and power pack will burn out.
d) When working on bulbs, unplug power pack or it may burn out.
http://www.malibulights.com/guides_support/low_voltage_planning_guide/select_your_power_pack

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

Feb 04, 2011 | Malibu Intermatic Inc. ML121RT Low...

1 Answer

I have the ML300RTW transformer. Just need to know about the trippers, one red and one black. Which one turns the system on and which one turns it off.


Here's how to check your power pack: Connect everything and set trippers randomly, and then manually rotate dial clockwise and watch when lights turn on-off, this will let you check if you have trippers set correctly.
As time passes, the dial rotates, and trippers push on-off lever that turns low-voltage lamps on-off.

If trippers no longer work, it's because trippers are worn down or the lever is worn out or the electrical contacts have burned. And the clock motors slow down and burn out.
There are no repair parts for low-voltage transformers. No trippers or timers.
"Harry" wrote to fixya with idea when timer no longer works: he bought cheap plug-in timer, set power pack to override, and then plugged power pack into cheap timer.

Since there are no repairs for low voltage transformers, I found tips that might save money:
The reason I add tips now, before power pack needs replacement is some fella wrote fixya.
He bought 500 Watt power pack to replace 300 Watt > thinking bigger was better.
Power pack burned out. Here's why:
a) Match wattage of bulbs with wattage of power pack
Lets say you have fifteen 20 watt bulbs = 300 watts, so install 300Watt power pack
b) Installing a 500W power pack on 300W of bulbs will burn out bulbs and power pack.
c) Replace bulbs as soon as they burn out or other bulbs will burn out and power pack will burn out.
d) When working on bulbs, unplug power pack or it may burn out.
http://www.malibulights.com/guides_support/low_voltage_planning_guide/select_your_power_pack

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

Jan 31, 2011 | Malibu Intermatic Inc. ML300RTW 300-Watt...

1 Answer

We have a Malibu/Intermatic timer on our landscape lights. This is the second one we have had and it is approximately 4 years old--200W. The last 2-3days, the lights come on at the time that is set but...


The ground shields are _required_ when connecting submersible underwater lights and 12 volt submersible pumps in water gardens and such.

As a licensed electrician, I must tell you to immediately unplug the power pack (transformer) from the 120 volt outlet and _DO_ NOT use it again until this problem has been solved. This is a definite FIRE HAZARD.
Based on what you stated, I strongly recommend replacing the existing 200 watt power pack with an Intermatic ML300RTW Malibu 300-Watt Power Pack or similar 300 WATT transformer.
ADDITIONALLY, I strongly recommend replacing the _entire_ existing main cable run with Intermatic ML12210 Malibu 100-Foot 12/2-Guage Low Voltage Cable. Make sure to get 12 gauge wire.
There are a few things going on here. First, the transformer is being overloaded. I suspect that you are running pretty close to 200 watts or more. Because the tranformer is overloaded it overheats and the solder in the built-in internal thermal overload melts and disconnects the circuit. When the transformer cools some, the solder in the overload solidifies enough to re-establish the circuit. If this cycle is allowed to continue, either the transformer burns out due to heat or starts a fire.
While these transformers are supposed to operate at full capacity, they will wear out quicker when operated in such a manner. For best results, don't operate the transformer at over 80%. For a 200 watt transformer that would be 160 watts ( 200 watts x .80 = 160 watts).
Secondly, I also suspect that the cable has been damaged, possibly when the siding was installed, and there is a short in the cable, which in turn is overloading the transformer. It's also possible that the end of the cable is shorting out.
In this case the only safe solution is to replace the cable. Even if you decide to keep the existing transformer and reduce the total wattage by using smaller watt bulbs or removing some lights, I still highly recommend replacing the cable.
Sorry to be so harsh about this, but this is a _serious_ matter. You've already had a fire in the mulch and melted the vinyl siding. If you don't feel comfortable dealing with this matter, please call a _qualified_ electrician.


Aug 26, 2010 | Hardware & Accessories

1 Answer

I just purchased some spotlights to add to my already installed malibu landscaping lights. I upgraded my transformer to 300 watts since the total wattage used comes out to 220. The lights on the end of...


Yes, using a larger wire will help, as will using more than one run. If you want too, you can leave the 16 gauge wire in place, then run the new 12 gauge wire and transfer most of the lights to the new run.

The fewer lights on a run, the less dimming will occur, so put more lights on the 12 gauge run.

Also, the longer the run, the more dimming will occur.
You may want to reconsider the location of the transformer, if possible. In your case, it would be better to locate the transformer in the middle of the current run, and just split the run in half to make a run in each direction. Of course, that depends if you have a 120 volt outlet available in that area.

Jan 03, 2010 | Malibu ML600TW - Low Voltage Power Pack -...

1 Answer

How do you set the timer on Malibu 300 watt transformer, ML300RTW. I have the pins in the right spots, but the timer doesn't go around. I there a on/off switch to activate the unit?


Make sure there is power to the plug. Then set the clock and install the on and off pins to control the lights. The on/off switch is for manually turning on the lights. The clock should run as soon as it's plugged in.

Jul 01, 2009 | Malibu Intermatic Inc. ML300RTW 300-Watt...

1 Answer

Intermatic ML300RTW not working


Yes this loose strands is probably the issue, the Transformer is working too hard and shuts down. you can make sure by removing all the bulbs but the last one and turning the transformer on, if it fails- you've got bad wiring. move the x-former closer to the lights so you don't have very much bad wiring.

Apr 09, 2009 | Malibu Intermatic Inc. ML300RTW 300-Watt...

1 Answer

How to make multiple runs for low voltage transformer


Yes, It will work fine splitting it into 2 runs connecting them together in the transformer. It will work better than running them all on one line. Sometimes running them all on one line the last light s dimmer than the first light. I was an electrician for 14 yrs. and I promise you it will work.

Nov 14, 2008 | Weatherproof WT-12 - Single Circuit ...

1 Answer

Landscape ligthing Transformer


Yes ican. They are made to be split into two 300 watt circuits. So it's ideal to place it at a location in the middle of you lights . Basically to go each direction from the transformer. Now you need to find out what wattage bulbs are in each light.(different fixtures can have different watt bulbs.) Lets say you have 8 lights going one direction and 8 going the other way and each light has a 20 watt bulb. That adds up to 160 watts on each side. So you are well below the 300 watt rating per side. By the way I wouldn't go anymore than 250 watts on a 300 watt circuit. Next you look on the bottom of the transformer and you will see the screws where you hook up the wire. You will need to strip the end of the wires about a half inch. Hook one set under the A & B for one side then do the same for the otherside. Plug in the transformer and set the timer to whatever tme of day and night you prefer. Hope this helps. If you have more questions just ask. Thaks and remember to rate me.

Oct 21, 2008 | Garden

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