My alarm suddenly started beeping. Just one beep about every 30 seconds with the letters Err displaying. What's up?

a smoke alarm yes

Fridge keeps beeping or buzzing: The following is for Frigidaire models but others can be addressed similarly.

Several Frigidaire refrigerator models have an electronic control panel on the freezer door the owner can use to adjust the internal temperature, dispense ice and water and receive notification about issues such as the need to replace a water filter. The refrigerators also emit a beep for various actions and as an occasional alarm. Determining what causes the beeps necessitates some troubleshooting.
Temperature Controls ·A Frigidaire refrigerator's display panel blinks when the control panel is touched to set temperature controls. After pressing "Freezer Temp" or "Refrigerator Temp" on the keypad, press the arrow buttons within five seconds to increase or decrease the desired temperature. If you do not press the arrow buttons within five seconds after pressing "Freezer Temp" or "Refrigerator Temp" on the keypad, the refrigerator beeps to indicate the current setting will stay in place.

Door Open ·When you leave the refrigerator or freezer door open, the refrigerator beeps. Also, the "Door Ajar" indicator illuminates on the appliance's display panel. Shutting the door and pressing "Alarm Reset" stops the beeping and turns off the "Door Ajar" indicator light.
·The Frigidaire refrigerator has a control lock feature that prevents use of its control panel or dispensers when the unit is locked. When the control lock is active, a beep sounds when a keypad or dispenser is pressed. Release the control lock by pressing the "Control Lock" icon for three seconds. A beep will sound, and the icon's light will go out.
Power Reset ·A power reset is occasionally necessary if the Frigidaire refrigerator's control panel does not work normally or a reset function on the keypad does not work. A power reset involves disconnecting power to the refrigerator by unplugging its power cord from the electrical outlet, waiting 30 seconds and plugging the power cord back into the electrical outlet. When the control panel resets, a beep sounds. If the refrigerator beeps even after a power reset and the beeps' source is not known, contact Frigidaire.


Read more :http://www.ehow.com/info_12148688_cause-beeping-noise-frigidaire-refrigerator.
Cause of Beeping Noise in Frigidaire Refrigerator eHow

Ram busted or slightly out of socket. Invert them.

The manufacturer has written this in their manual for your unit...

"Err" displayed -battery icon may show any state of battery capacity. One quick beep every 30 seconds. Unit is Error condition

Replace batteries. If "Err" (or blank display) continues, unit has malfunctioned. Replace immediately.

Link to manual...

http://portalgb.knowledgebase.net/utility/downloadArticle.aspx?aid=294720

battery is dying!

They only last 7 years, after which they beep every 30 secs. You need new ones.

1. Change batteries.
2. Clean it.
3. Swap it with another location if you can.

If it still does not work properly consult the local fire dept. for free.

You may have to take it in repairs if all fails.

the sense is bad, unfoturally the unit need to be replaced.

Here is a link to the manual, or you can call the consumer hotline at 1-800-880-6788

Ok the washer is telling you we have a problem. I will tell you how to retrieve the code and then ill tell you what that code means
1. Wake the washer by pressing any button.
2. Wait 5 seconds.
3. Press and HOLD the Start/Pause and Cancel
buttons simultaneously. As long as the buttons are
held, the failure code will appear in the display as an
E followed by two numbers, a number and a letter or
two letters. The controlwill beep and the Door Lock,
Wash, Rinse, and Final Spin indicator lights will
flash.