Wireless Combination CO/Smoke Detectors Posts

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Alarm Grid is aware of Technical Notification #55 that identifies possible premature low battery warnings for Honeywell Combination Smoke and CO Detectors. Affected products include the Honeywell 5800COMBO, the Honeywell SiXCOMBO, and the new Honeywell Home PROSIXCOMBO for the PROA7PLUS.


According to Technical Notification #55 from Resideo, most instances of a premature low battery condition occur after replacing the batteries in a Honeywell 5800COMBO, Honeywell SiXCOMBO, or Honeywell Home PROSIXCOMBO. This notice pertains only to a low battery condition that occurs immediately, or almost immediately, after replacing the batteries in a sensor that has been in use for several years.

Each of the aforementioned combination smoke/CO detectors uses four (4) lithium 3V CR123A batteries for power. A premature low battery condition is when the sensor falsely indicates that the batteries inside the sensor are low on power, and a corresponding trouble condition is displayed for the associated zone(s) on the panel. But while the sensor is falsely indicating low batteries, the actual reality is that the batteries are still at, or near, full power.

Resideo states that the false low battery condition is the result of intermittent connectivity between the batteries themselves and the nickel battery contact points inside the sensor's battery compartment. The best way to verify that the low-battery condition is indeed false is to take a voltmeter reading of the batteries. If you find that the reading for each battery is at or above 3V, then you can confirm that the low battery condition is false. Any one of the four (4) batteries that reads below 3V could cause a low battery indication.

Additionally, Resideo suggests taking the following steps to see if a low battery trouble condition can be cleared:

  • Make sure each battery is properly seated and secured in its holder.
  • Make sure the battery contacts are snug with no movement.
  • Make sure the battery as well as the battery contacts are clean, and wipe them with alcohol or a mildly abrasive cloth if necessary.
  • Remove and reinstall the batteries to try and clear the trouble condition.
  • Replace old batteries with fresh ones to see if the trouble clears.

As a reference, the aforementioned sensors will typically report a low battery condition once the detected voltage drops below 2.3V. If you have a premature low battery condition on one of these sensors that you cannot otherwise clear, then make sure to check the batteries regularly and replace them as soon as necessary. If possible, try performing the steps above to see if you can correct a premature low battery condition. It may be necessary in a worse case scenario to replace any sensor affected by this condition. Attempting to use a sensor displaying a consistent low battery trouble is certainly not ideal, even if that condition is known to be false. Remember that these are life-safety sensors, so keeping them consistently powered on and functioning properly is crucial.

If you have any questions about this issue, then please not hesitate to email our support team at support@alarmgrid.com. We check our email from 9am to 8pm ET M-F. We look forward to hearing from you!

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