My ULT31502 UPS failed so dramatically that the brownout reset my cable box and the clock on my microwave (both on different circuits). I turned it back on and it beeped once but did not emit the two short beeps a few seconds later that it used to. UPSMon told me that the battery was cycling between 59% and 68% of full charge, and when I removed the batteries, one was 12 volts and the other only 9. Obviously, one of the batteries has a shorted cell but I am worried that the failure was so dramatic that the unit might now be useless if I replace it (or them). Any suggestions/info

Could be magnetron failure (shorted)

Sounds to me like a fault with the main circuit board. Lets say the microprocessor on the board is bad and it locks up or just doesnt display the clock or time. When you reset the breaker you are resetting the main board. and it works until the processor fails again. Sound like may need new main PC board. Timer board. Caution!! Pricey??? Check cost of board before persuing, may be more wise to replace unit. and get new full warranty

Sounds like your losing power, have you tried it on a completely Different circuit??? Either that or bad fuse or connections inside of microwave.

could be your power. If you get brown outs in the AC power.
http://www.mnn.com/earth-matters/energy/stories/what-to-do-in-case-of-a-brownout
. You could try using an UPS on the device.
http://en.wikipedia.org/wiki/Uninterruptible_power_supply

It is hard to know if it is due to brownouts and if the tech came out to check your modem the power brownout may not have occurred during the visit. Maybe Charter could lend you a UPS or some kind of power monitoring device to log the power levels out of the power point over a time frame to see if this is the cause of the problem.

Disconnect the microwave from the power source while the power is still out. If the microwave is a built-in, turn off the circuit breaker. Otherwise, unplug the microwave from the wall outlet. This prevents a power surge from damaging the magnetron tube when the power is restored.Turn on the circuit breaker or plug the microwave into the outlet only when you are sure that the power is permanently restored. If there are still storms in the area, the power may be disrupted again. Reset the clock on the microwave. Microwaves vary slightly on how to set the clock, but usually there is a clock button you press. Use the number pad to input the correct time and press the clock button again to set it. Test the microwave by heating some water to ensure that it is still in good operating condition.

Hello

Remove the plug from the wall outlet and wait about 10 seconds before re-inserting it. The plug must be firmly inserted to transfer electricity to the appliance.


Open your home's circuit breaker box and reset the breaker if it has tripped and is set to the "Off" position. Simply slide the breaker over to the "On" position to fix a breaker that has tripped.


Plug a different appliance into the same outlet to make sure the outlet you are using is functional. Plug the microwave into a different outlet to see if this yields different results.


Press on the microwave door to ensure it is completely closed. The microwave will not function until the door is fully shut.


Press the "Start" pad on the display panel after setting the time. Failing to press this will result in the microwave not knowing that it should start.


Press the "Stop/Reset" pad on the panel if a program different from the program you want to run has already been entered into the system.


Press the "Clock" pad three times to turn off the demo mode. The demo mode will not allow the appliance to turn on and cook as it should.

Remove the plug from the wall outlet and wait about 10 seconds before re-inserting it. The plug must be firmly inserted to transfer electricity to the appliance.


Open your home's circuit breaker box and reset the breaker if it has tripped and is set to the "Off" position. Simply slide the breaker over to the "On" position to fix a breaker that has tripped.


Plug a different appliance into the same outlet to make sure the outlet you are using is functional. Plug the microwave into a different outlet to see if this yields different results.


Press on the microwave door to ensure it is completely closed. The microwave will not function until the door is fully shut.


Press the "Start" pad on the display panel after setting the time. Failing to press this will result in the microwave not knowing that it should start.


Press the "Stop/Reset" pad on the panel if a program different from the program you want to run has already been entered into the system.


Press the "Clock" pad three times to turn off the demo mode. The demo mode will not allow the appliance to turn on and cook as it should.

I have gone through a few UPS, Im lucky to get 3 to 4 minutes if my power is cut.
I think most people plug too much into the UPS sockets.
The Battery backup protected sockets cant take the drain from everything over a prolonged period of time.
The nature of rechargable batteries means that when plugged permanently into a power supply they get damaged (li-on batterys especially).
Im afraid i cant help with this UPS, looks like you need a new 1.
I now only have my PC/Monitor/modem and router plugged into the UPS protected sockets.
Speakers / printer and other stuff are plugged into the unprotected sockets.

The clue is that you have to reset the clock. You are losing power somehow. the Main Board thinks it is being unplugged and it resets the clock and you have to start all over. The fact that after so many times it will finally work tells me that whatever bad connection you have is finally getting hot enough to expand and make a good enough connection to keep working. Intermittant connections are the worse to find. A lot of trial and error to find the problem. can be bad fuse and fuse holder ( in the unit), bad outlet, loose wire at circuit breaker, loose wire at outlet. Even a loose breaker where it snaps onto the buss bar in the Breaker Box. Etc, it an really drive you nuts trying to find it. Try the unit in a totally different area making sure it is on a compleately different circuit breaker and see what it does, if the problem follows the unit, the problems is in the unit. If not, electrical problems, outlet, breaker, panel,

Sounds like the controller board has failed, assuming a circuit breaker has not tripped or fuse has not blown.
If all you do is reset the clock, and then it looses time, regardless of using the microwave, then it points to the clock/controller board.
If this only happens when you use the microwave portion for a few seconds, I would be suspicious of the microwave circuit, where there are several components that could cause the failure.