For some reason, five landscape lights went out at same time. One flood light still is powering on. Tried changing the bulbs. Wiring is fine. Is it a problem with the box itself?
Doesn't seem to me it could be the transformer/controller as it either puts out voltage and current or it doesn't. I can't think of any way it would selectively operate certain bulbs. You said wiring is fine, but you should check voltage at the end of the line to ensure it's getting close to 12 volts all the way down the wiring. If not, there may be a problem between transformer and misbehaving bulbs. Doesn't seem likely that 5 bulbs would go out a once, but that would be all that's left.
SOURCE: Malibu landscape transformer
I discovered that I hadn't turned the manual switch to off on the one that wasn't working properly.
Now they both work fine. The instructions that come with the Malibu Transformer is not easy to understand and it does not go into enough detail. There isn't a trouble shooting section which would help.
SOURCE: Malibu transformer shuts down early
I'm thinking that a better brand is in order. Mine shorted out and started a fire. Luckily we had just returned from vacation and put it out with a hose.
SOURCE: I have a Malibu ML300RTW transformer with a 50 ft.
Usually 50 - 75 ft. is as far as you want to go, especially with 16 gauge wire. What happens is the lights get dimmer as the length of the run increases. If you don't mind the lights getting noticeably dimmer, go ahead and add the other 4 lights. Using a heavier (12 gauge) wire will help a lot. You'll want the 12 ga. to start at the transformer, preferably running the whole length. Also, using a smaller watt bulb will help.
If you have a 120 volt outlet near the approximate middle of the new (total 150 ft.) run, you could relocate the transformer to that location and have two 75 ft. runs in 2 directions.
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SOURCE: I have a ML300RTW Malibu
You can buy cheap plug-in timer, set power pack to override and then plug power pack into cheap timer.
Otherwise there are no repair parts for power packs other than on-off trippers.
Power packs come with 5 year limited warranty, so you are within warranty period. Good job saving the date of purchase, you outshine with that detail.
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 with your experience so others with same-similar problem can benefit.
Also take advantage of fixya expert assistance live.
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Try the transformer on different outlet.
Move wires inside breaker box to different circuit breaker.
Check is breaker is loose, or makes crackling sound.
Copy following links for resources:
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html
http://waterheatertimer.org/pdf/How-to-find-ground-fault-in-household-electric-circuit.pdf
If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
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