Just wanted to report: I've had similar issues with my Garmin Descent T1 transmitter. Garmin are currently in the process of organising a replacement.
The Garmin transmitter seemed fine from when I purchased it (Feb 21) to when I had to stop diving due to COVID lockdowns (May 21). When I returned to diving (Oct 21) I found that it was giving readings 18 to 40 bar below multiple analog SPGs and my Shearwater transmitter. I could see in my logs that my dives were all starting at 185 bar to 195 bar where they would previously start around 210 to 220 depending on the fill.
* The battery was still listed as "Good" in the Dive Settings on the watch, and when I removed it my multimeter still showed 3.04V. Changing to a fresh battery did not help.
* Changing from direct attachment to the first stage regulator to a 6" high pressure hose (with the supplied spool) did not help.
* There had been alerts on my watch prompting me to upgrade the firmware around the same time. It is currently on SW Ver 2.60 and that is apparently the latest.
I think there was mention of a "hard reset" procedure earlier in the thread -- is anyone able to provide details of that, if it's not as simple as removing and replacing the battery? Garmin didn't ask me to try anything of the sort, they accepted my photo evidence of transmitter reading vs. SPG in multiple scenarios, that the battery was still reported "good", that changing the battery didn't help, etc.
Just waiting on them to tell me where to send the old unit for replacement.
The Garmin transmitter seemed fine from when I purchased it (Feb 21) to when I had to stop diving due to COVID lockdowns (May 21). When I returned to diving (Oct 21) I found that it was giving readings 18 to 40 bar below multiple analog SPGs and my Shearwater transmitter. I could see in my logs that my dives were all starting at 185 bar to 195 bar where they would previously start around 210 to 220 depending on the fill.
* The battery was still listed as "Good" in the Dive Settings on the watch, and when I removed it my multimeter still showed 3.04V. Changing to a fresh battery did not help.
* Changing from direct attachment to the first stage regulator to a 6" high pressure hose (with the supplied spool) did not help.
* There had been alerts on my watch prompting me to upgrade the firmware around the same time. It is currently on SW Ver 2.60 and that is apparently the latest.
I think there was mention of a "hard reset" procedure earlier in the thread -- is anyone able to provide details of that, if it's not as simple as removing and replacing the battery? Garmin didn't ask me to try anything of the sort, they accepted my photo evidence of transmitter reading vs. SPG in multiple scenarios, that the battery was still reported "good", that changing the battery didn't help, etc.
Just waiting on them to tell me where to send the old unit for replacement.
