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Follow-up:
Last night the CO2 sensor started beeping (about once a minute) while flashing the “fault” light. The unit had previously been left “disabled” and not reporting, so the E27 did not report any issues. I physically removed the unit which is when I discovered that the AAA batteries were damaged. One had expanded and split open so the battery slot was all corroded. Its possible I got a bad battery, but I’ve never seen that occur before in a relatively new battery (less than a year old). Has any one reported a similar experience? Could a flaw in the power supply of the CO2 sensor cause the battery to be over-drawn, and maybe have been the source of the communications issues? If you’d like to examine this one, I’d be happy to send it back.