I replaced an old Malibu 300 watt powerpack with a new digital 300 watt Malibu power pack and when I turn it on it runs for about a miniut and then shuts down. I have 15 11watt light on it, the same as the old one. Any suggestions on why it shuts down? Thanks

SOURCE: Malibu ML200RT low voltage power pack is not working

First check to make sure that you do not have more watts pulling than is recommended. If this is ok then pull both the red and black plastic pin from the timer and replace them then try. If neither of these solutions work you may have a problem at power source.

SOURCE: I currently have a 600 watt power pack w/timer on

20A circuit x 80% service factor =16amps continuous. 16amps x 120V = 1920 wats. Your total would be only 900 watts. I have assumed that since you have a 20A ground fault breaker that you have #12 ga copper conductors. If you had a considerable distance the 16 amps continuous would drop due to voltage drop and so the total wattage would also, but you're way below these levels.

SOURCE: Malibu 300-Watt Low Voltage Transformer ML300RTW Not Functioning

My power went off at my house. After it came by on how do I reset the transformer to come on automatically?

SOURCE: My Malibu 200 Watt Power

There is no fuse and no repair parts

I've been all over the Malibulights.com website looking for anything that might help the large number of people with Malibu questions. The website has very little information and no parts and the site offers no help except the following:

1) Malibu gets the customer money, and other people troubleshoot for their customers
2) When buying a power pack, the total bulb wattage on the line has to match the power pack wattage
10 - 20 watt bulbs = 200 Watt power pack
15 -20 watt bulbs = 300 Watt power pack
http://www.malibulights.com/guides_support/low_voltage_planning_guide/select_your_power_pack.aspx
If your power pack is oversized, it will burn out the bulbs and burn out the power pack

3) A power pack makes a humming noise when it has power >>> check your power source if power pack won't work >>> no other troubleshooting is offered
4) Replace burned out bulbs ASAP or the power pack burns out the other bulbs
5) Unplug power pack when working on bulbs [otherwise, the power pack burns out which is why people write fixya asking why their power pack won't work after replacing all their bulbs]
6) Nowhere on the Malibu site does it offer-or-explain burned out power packs or power packs that don't work, but they show plenty of new products for you to buy.

SOURCE: The timer feature of my Malibu 300 watt power pack

Unfortunately when the power pack stops working there is no solution.
Your power pack has electricity so that is not the problem.
The bulbs turn on, so the bulbs are ok.
That means the power pack has malfunctioned, and needs to be replaced.

I did find some tips to help folks preserve their power packs:
1) Match wattage of bulbs with wattage of power pack
-15 each X 20 watt bulbs = 300 watts, so install 300Watt power pack
2) Installing a 500W power pack on 300W of bulbs will burn out bulbs and power pack.
3) Replace bulbs as soon as they burn out or other bulbs will burn out and power pack will burn out.
4) 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