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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 only stay on for 15-20 minutes. Before this we had a

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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.

Posted on Aug 30, 2010


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Do not buy expensive timers with photoeye unless purchased at local store where ez exchange can be made for several years.
Copy following link to help identify timer:

2) Buy Intermatic-Malibu power pack with 5 year limited warranty:

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More information is needed.

Open following link for Intermatic-Malibu resources:

You say clock doesn't work.
Add a comment with following information:
Do you have timer with analog dial?
Does dial rotate as time passes?
Does dial keep good time?
Have you put the black and red trippers in place?
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Upvote the help.
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Open following link for power pack troubleshoot checklist and power pack resources.
Intermatic links do not work on weekends, April 2011

Add a comment for more free help

Also take advantage of fixya expert assistance live.
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For information on Intermatic/Malibu power packs showing troubleshoot steps, replacement trippers, links to manuals, useful links, warranties and tips:

Add a comment with your experience so others with same-similar problem can benefit.

Also take advantage of fixya expert assistance live.
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