Malibu transformer wont power lights - Intermatic Malibu 300W Power Pack Transformer ML300RTW

be sure to unplug transformer when working on lights, or it can burn out.
Troubleshoot resources on following link:
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Hot transformer is fire hazard... warmish transformer is normal... replace transformer
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

Gene

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Plug power pack into cheap wall timer, and that will operate lights until warranty is resolved with Malibu or product-seller.

Simple power outage, or nearby lightning strike, can cause surge that will knock out digital timers. And knock out analog series power packs too.
You probably need receipt for warranty claim.
This timer is not shown on Intermatic site, and not subject to Intermatic 5-year warranty, but certainly Malibu must have a warranty of unknown length, and a corresponding claim procedure.

Double-check your installation, and additional resources:
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

Whole-house surge protection is hot item among folks these days since so many household items are now electronic, including appliances, washer-dryer, water heaters, timers, etc.
This will protect both 120Volt and 240Volt circuits, although it is unknown if your timer failed because of surge..
http://waterheatertimer.org/How-to-wire-Whole-house-surge-protector.html

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

http://waterheatertimer.org/Malibu-power-pack-stopped-working.html#troubleshoot
Comes with 1 year warranty
Gene

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

http://waterheatertimer.org/Malibu-power-pack-stopped-working.html#troubleshoot

http://waterheatertimer.org/Malibu-power-pack-stopped-working.html#install

Gene

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Open following link for Malibu troubleshoot resourceshttp://waterheatertimer.org/Malibu-power-pack-stopped-working.html

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Sounds like the transformer died which isn't uncommon. One cause is overloading the circuit (too many lights) figure out the total wattage by adding the bulb watttage usually 11 by the amount of lights you have. I would buy a transformer with around 200 Watts higher than you need to allow for expansion and the transformer wont have to "work" as hard.

My malibu transformer has a reset button on the back near the terminal connections. If the transformer is on (time displays on the panel) but the light fixtures are not lit, look for the reset button on the back and depress it.

Tripper might be worn down and not pushing switch.
Switch might be broken or worn down.
Improvise by setting timer to override and plug power into cheap plug-in timer.

For 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

Testing ohms across A and B will read open circuit through transformer coil.
Testing DC voltage across terminals A and B should read 12 volts DC, and nothing less.
Transformer should make humming sound when working.
Test that receptacle has power and breaker is not tripped.

There are no repair parts for power packs, but they come with 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