Question about Kidde PE120 Hardwire with Battery Backup Photoelectric Sensor Smoke Alarm

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Replaced batteries in both smoke alarms and cleared any dust around connections and the alarm will not stop going off. there is no smoke etc that would cause the system to continue to go off.

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Posted on Jan 02, 2017

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SOURCE: My alarms are chirping every 30 seconds or so. I

Depending on manufacturers and such, the catalyst detector element itself may need to be replaced occasionally. Usually cheaper and faster to just get another detector.

Posted on Nov 02, 2009

  • 25 Answers

SOURCE: i changed the battery in my smoke alarm and it is

Use a quality battery duracell or energizer. Not ones from the dollar store.

Chirping means low battery.

Posted on Jan 25, 2010

  • 1 Answer

SOURCE: kiddie fire alarm model I12060, beeps once every

This happened to me, my smoke detector started chipping so I changed the batteries. A few seconds later it started chirping again. The answer is in the way you put the batteries in. The smoke detector allows you to put the batteries in wrong and makes a slight connector. This slight connector tricks the detector into thinking the batteries are weak. Simply turn the batteries around so the fat connector of the battery touches the skinny connector of the device. Mine was, fat side on the right.

Posted on Feb 28, 2010

  • 13 Answers

SOURCE: kidde smoke alarm won't stop chirping

Most smoke detecotrs have a limited lifespan of 5-10 years. On the underside of the detectors should be a sticker with installed dated or replace by date. If changing the batteries doesn't stop the chirping it is most like time to replace the detector. If you check the manufacturer website they will give you a life expectancy for your detector.

Posted on Mar 23, 2010

  • 10865 Answers

SOURCE: I have the kidde carbon

Remove the battery again and use the eraser end of a common pencil to clean the battery contacts inside the detector. Also get a brand new battery as often batteries sit on the store shelf or your own shelf and gradually lose power. J.

Posted on Oct 03, 2010

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1 Answer

How do I stop smoke alarm from beeping


Smoke alarms beep in two different ways: it beeps continuously when smoke is present, and it beeps every so often (intermittently) when the battery needs to be replaced.

Feb 18, 2015 | Cars & Trucks

1 Answer

Does this model have a battery backup?


All smoke alarms that connect to your household electricity must be replaced every 10 years by code (NFPA 72). Chances are the device is indicating low battery, but it is time to replace it and all others of the same age. Check your local hardware store or call a licensed electrician to replace them.

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1 Answer

How can I stop my smoke detectors from beeping?


If we're talking about smoke alarms, either battery powered or connected to the household electricity, replace the battery (many electric smoke alarms have a battery for backup). These must be replaced every 10 years as well. Check the label on the bottom of the device (sometimes on the face for CO detectors) for instructions.

Sep 28, 2014 | Home

2 Answers

Fire alarm keeps going off randomly and there is no fire or smoke


What type of smokes detectors are you using. Is the Zone programmed correctly. Loose connection. Missising resister

Mar 09, 2014 | Honeywell Ademco Alarm 6150rf Keypad Lk

1 Answer

My alarm is testing multiple times a day


Check that the battery is installed the right way around. Most smoke alarms can only be tested manually (by pushing the button). If you are hearing a single beep every 50 or 60 seconds then this is the low battery indicator and this will sound if the battery is inserted the wrong way around. If the siren is actually sounding continually then your smoke alarm might be clogged with dust or other foreign matter. All smoke alarms should be replaced every 5 to 7 years as the components in them only have a limited life span.

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Two first alert smoke detectors go off for no reason. All are on 110 with good batteries. Have had these for approx. 12 years with no problems until now when 2 of the 7 have gone off many times in the last...


There may be dust built up in the sensing chamber. This can cause alarms to go off for no reason. Try vacuuming the alarm off particularly around the sensor if the cover is removable. These alarms should be replaced however, as they are more than 10 years old.

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3 Answers

Why do all of my alarms go off when I am vaccuming in one of my rooms. Other rooms are fine. The noise stops as soon as I stop the vaccuum.


The reason they all go off, is that they are hard wired and all alarm, even if let's say, there's only smoke in one room. It's a safety feature, so that everyone in the house, not matter where they are in house, will know an alarm has sounded.

As to why your vacuum sets of the alarm is somewhat of a mystery. Could it be the vibration? Possibly, but unlikely. Could it be dust that's kicked up by the vacuum? This is more of a plausible reason.

I suspect, that the smoke alarm may have a coating of dust already in it. When more dust or air movement is generated, it trips the alarm.

This can be remedied by cleaning all the detectors with canned compressed air with a straw nozzle (like you clean your computer with). Simply, remove the cover(s) and blow out the inside of the detector(s). If you can't get the cover(s) off, most had wired detectors have a battery backup in each detector, in case of a power outage. Remove the battery(s) and use that opening to gain access to the interior of the detector.

I think this will solve your "alarming" problem.

Mar 01, 2011 | Universal Security Instruments AC Hardwire...

1 Answer

Alarms keep going off but no fire


There may be a short in the system. But
Hopefully, that should solve the problem. Please let me know.

Feb 12, 2011 | Kidde 4618 Firex Hardwire Ionization Smoke...

2 Answers

Replaced 9 v batteries, units still chirping


This is the troubleshooting information from the kddie site. The problem is usually related to an older battery or improperly installed battery. You might also have to do a reset as described below. If battery and cleaning don't work, it might be time for a replacement - short money to keep you and your home safe.

  1. The battery may be loose, or improperly installed.
    Verify that a battery of the recommended type is securely installed. Make sure to use a battery with a use-by date no later than four to five years in the future. Check that the battery is snapped in completely so it cannot be shaken loose. It’s possible that battery connections may not be making good contact with the battery. Disconnecting and re-connecting the battery once or twice will likely fix this condition. On units with a front-load battery, be sure that the battery compartment door is closed completely as well. Loose white neutral wire can cause an echoing chirp. (From one unit to the next)

  2. The smoke alarm sensing chamber may be dirty.
    Dust and insects can collect in the sensing chamber of the alarm. An accumulation of dust in the sensing chamber can cause the unit to chirp. It is good practice to clean the smoke alarm when you change the battery. Static electricity from the ac quick connector attracts dust and can cause false alarms.

    Cleaning smoke alarms:
    To clean your alarm, remove it from the mounting bracket as outlined here. You can clean the interior of your alarm (sensing chamber) by using compressed air or a vacuum cleaner hose and blowing or vacuuming through the openings around the perimeter of the alarm. The outside of the alarm can be wiped with a damp cloth. After cleaning, reinstall your alarm, verify the green LED is on and test your alarm by using the Test Button. If cleaning does not restore the alarm to normal operation, the alarm should be replaced.

  3. Check environmental conditions:
    • Humidity, steam and condensation can cause false alarms. Causes of condensation are:
      • Extreme temperatures changes.
      • High ambient humidity.
      • Unit being installed in an uninsulated electrical box mounted on a ceiling beneath an attic. If this condition exists you’ll want to move the alarm. Click here to see the correct alarm placement in your user’s manual found in our Download Center.
    • Check to see if there is a cooling/heating register, a ceiling fan or an open window within 3 feet of the alarm. If there is, move the alarm away from the source of the increased airflow. Click here to see the correct alarm placement in your user’s manual found in our Download Center.
    • Check the temperature of the room. Smoke alarms operate at 40 degrees to 95 degrees Fahrenheit. Carbon monoxide alarms operate at 40 degrees to 100 degrees Fahrenheit.

  4. Reset the alarm.
    Some current model smoke alarms have a processor that retains certain error conditions, such as a weak battery. The error condition should reset when the battery is replaced but sometimes it does not and must be manually reset to clear the error.

    To reset an AC unit with a battery backup:
    Turn off the power to the smoke alarm at the circuit breaker.Remove the smoke alarm from the mounting bracket and disconnect the power. Remove the battery. Press and hold the test button for at least 15 seconds. The unit may chirp or alarm for a few seconds before going silent.Reconnect the power and reinstall the battery. The unit will chirp once when the power is restored and should not chirp afterwards.

    To reset a DC only unit:
    Remove the battery. Press and hold the test button for at least 15 seconds. The unit may chirp or alarm for a few seconds before going silent.Reinstall the battery. The unit will chirp when the battery is first connected but should not chirp afterwards.

  5. An electrical condition may be causing the power to the unit to be interrupted.
    If the AC power to the unit is interrupted, the unit will chirp when the power is restored. This could be caused by power surges.
    If the chirping seems to occur at about the same time in the evening or morning, it could be due to a surge created when the power company switches electrical grids to meet demand. Check to see if the chirp (or chirping) occurs when something else in the house is turned on such as an exhaust or attic fan, a heater, etc. If the smoke alarm is connected to a circuit with such a device, the alarm may chirp when the other device is switched on. If this is the case and the device is plugged into a wall outlet, move it to another outlet on a different circuit. If it is a hardwired device, have an electrician investigate it. These conditions can be minimized by installing your alarms on a dedicated circuit in compliance with NFPA requirements.

  6. Replace the alarm.
    If none of these conditions exist and the suggestions don't alleviate the symptom, the alarm should be replaced. Age may be a factor. Smoke and heat alarms should be replaced every 10 years, and carbon monoxide and combination alarms should be replaced every 7 years. Most of our alarms have a 5 year warranty from date of purchase (check your user manual for details). A date code is stamped on the label attached to the back of the unit.

Feb 02, 2010 | Kidde 1275 Hardwire Smoke Alarm with Hush...

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