I set the timer for 20 seconds, it started blinking and timer went off, but would not start. Now it just sounds the timer and I am unable to set anything.

It sounds like you may be experiencing an issue with your Kenmore stove's timer function. Here are a few steps you can try to resolve this issue:

Check the timer settings to make sure that the correct time and alarm settings have been entered.

Try resetting the timer by turning it off and back on again, or unplugging the stove and waiting a few minutes before plugging it back in.

Make sure that there are no buttons or knobs stuck on the stove, as this could cause the timer to activate repeatedly.

If these steps do not resolve the issue, it may be necessary to contact a professional appliance repair service for further assistance.

if its old it might be dirty where u cant see causes lots of prob

see this steps and fix it. God bless you

Reset the clock. Press "Clock" and the correct time, using the number pads. Press "AM/PM" if applicable, and press "Start" or "Clock" to confirm.

2 Press "Timer On/Off" to reset the timer if nothing on the touch pad will operate. Use the number pads to select a new timed amount, if desired, and press "Timer On/Off" to start. Press again to cancel.

3 Press and hold "Clear/Off" for three seconds if the timer will not function or is blinking when you touch the pads. This will release the "Child Lock" feature. Make a new touch pad selection.

4 Disconnect power to the microwave if following Steps 1 through 3 does not resolve the blinking timer. Wait a few minutes, and then restore power to reset the microwave.

However if the problem persist the display board
main control board is faulty

Operating functions:
To set the clock, press and hold the clock/timer button for three seconds. A clock icon will appear on the left side of the screen. Input the time using the numerical buttons and then click the clock/timer button to save the time.
To set the timer, press and release the clock/timer button so that the display shows all zeroes. Enter the desired time using the keypad. Press start/stop to start the countdown. The countdown may be paused by pressing the stop/start button and resumed by pressing the same button again.
When countdown is complete, timer will beep continuously for thirty seconds and display will flash. Timer will then beep every ten seconds for ten minutes until the stop/start button is pressed.
This timer will also time up to time activities. To start count up, press clear/memory so timer reads all zeroes. Press stop/start and a plus sign will appear on the right side of the screen as the timer begins counting up.

The first step is to set the clock. To do this, push clock, set the time using the key pad and then PUSH clock a second time.

Once that is done you can set the timer by pushing timer, putting in the number of minutes you want and pushing start.

If it went dead almost immediately after pressing the Start pad, that\'s usually a shorted high-voltage capacitor.



If it went dead a few seconds after pressing the Start pad, that\'s usually a failing high-voltage transformer.



Here are some links with info on part testing:



http://www.microtechfactoryservice.com/cap_test.html
http://www.microtechfactoryservice.com/diode.html
http://www.microtechfactoryservice.com/mag_test.html
http://www.microtechfactoryservice.com/xformer.html




You can usually find helpful exploded view diagrams and order parts by
entering your full model number here: http://tinyurl.com/gv383



Please write back with your brand and model number if you need further help.



We\'re happy to help and we appreciate your thoughtful rating of our answer.

Sounds like your timer board is fried. Replace it.

you have a bad inverter board.