Garmin 810 won't pair with HRM's

Replaced my old 800 with an 810 but it just will not find either my old Premium HRM or the new one with the fatter strap. It finds my speed and cadence sensors (new versions) and my Vector PM. I've tried a new battery and I've tried flipping the battery to reverse polarity then flip it back again and I've done two factory resets. No deal.
Any tips?
Any tips?
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On my squeeze's bike, her Garmin would pair with her HRM but not cadence (despite trying three differeht cadence sensors).
If your Edge is newish, Garmin should replace without argument
Sorry to hear of your problems with the 810. I have just bought one too and endured the same initial problems with the HRM.
After a to and fro with the retailer, I bought an 'ATC lithium CR2032' battery from Maplins at £4. Silly money, I know, but the device now gives consistent, reliable readings.
I notified the retailer via email (they must've thought, 'stupid punter', etc) because it may be the case that a consignment of devices could be arriving with a worn out battery, given that these gadgets are probably sitting around for many months before they end up in our hands.
Anyhow, good luck with the remedy. I have a Bryton Rider 50 and over a 4 year period the HRM has been good but not brilliant. I get the feeling that if anything's going to be a bit temperamental it's going to be the HRM.
Regards
Kevin
But when the batteries have a 5-10 year shelf-life, months is insignificant - especially as they should be supplied with a tag that you have to remove to activate them. As a case in point, the last two batches of CR2032 I bought have an "install by" date of January 2023 & December 2024...
Of course - I only buy 'branded' CR2032 (in bulk they're cheap as chips) - OEMs may well be buying lower quality (read: "shorter shelf-life") examples to save a couple of pennies per battery.
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