Try unplugging power pack and see if it resets.
A lot of folks write fixya with power pack problems.
There are no repair parts, although guys write in and say they were able to take the unit apart, nobody reports being able to repair a power pack once it goes bad.
Also I have searched Malibulights, Intermatic, e-bay etc for parts and repair information.
There seems to be no way to repair power packs.
Maybe you will come across a great solution and add a comment so we can help others.
'Harry' wrote in with a work around: He bought a cheap plug-in timer, set Power Pack on override, then plugged Power Pack into cheap timer.
Harry also said his Power Pack was defective within the 5-year warranty.
He was negotiating with malibulights,com for a refund.
No word how that came out.
After hours searching for solutions, the best I found were tips for next power pack that might save money:
The reason I add these tips now, before your power pack needs replacement is some fella wrote-in.
He bought 500 Watt power pack to replace 300 Watt > thinking bigger was better.
Power pack burned out. Here's why:
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
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.