I also have a monitor which reads "Err" and ocassionally, "E09", and
continues to beep even after battery has been replaced. The number on
the back of the unit is 2699 and we have had it for a number of years.
Time to replace?
Probably the sensor of
your device is broken. The lifespan of the electrochemical sensor of the Carbon
Monoxide Detectors is different, especially for the cheaper models it is 2-3
years, for the others it is 5-7 years. So how long your carbon monoxide detector
will work depends on where it works and how it works. If you use the detector in
the kitchen or in the bathroom, it will have a shorter lifespan. Itâ€™s important
to know that you should buy a detector that has been tested and has
certificates. You can take a look at the two models we offer in the website,
they are delivered from the manufacturing plant. In order to reduce the price we
order large quantities of the items and store them in a warehouse in Hong Kong,
and when ordered, they are delivered to the address in the US.