Nerd 2 controller (Cho2ptima) log shows "?" Under "mode" and no gas pressures

[Rollin Bonz]

This happened on today's second/ (last) dive, and has happened at least one other time. Going through the dive log post dive, getting data and noticed under "mode" (third screen in the display dive) where a dive normally shows "CC/BO", it shows "?". Also, no pressures (T1, T2, O2) were saved, all that shows are N/A for all entries. Oddly, the surface interval is also incorrect. It shows 41 mins. Looking at the end time of the first dive and start time of the second dive (which are correct), it should be 1 hour and 50 mins.

New unit, did my certification with it in June. 34 hours total to date. Firmware ver 87.

Nothing weird during either dive today (similar profiles max depth 133, avg depth 73, total runtime 85 mins). I track pressures during the dive on my perdix, so I don't know if they registered at all on the nerd.

Anyone else experienced similar gremlins?

edited to reword/clarify

 

[Rollin Bonz]

I am corresponding with Shearwater via email on the issue. Figured I'd update if anyone is interested or following.

Additional oddities I've noted.

I have 2 "bad" logs (no AI readings and no mode) that fail to transfer to Shearwater desktop, although a confirmation screen appears that they were downloaded. The one that prompted the post (35) and the one I remembered having once before (29)

surface mbar on the "bad" dives shows "0000", other dives at same dive site show "9880"

GF value shows odd numbers on the bad dives, one "65/01" and one "65/16" instead of the set GF of 65/85

file dump of some supporting pics of the Nerd screens

 

[Rollin Bonz]

Screenshoots of Shearwater desktop showing dive transfers from the Nerd for dives 29 and 35 ("bad" dives) and then a screenshot of the dive log after clicking "ok" to import them. 29 and 35 are missing.

 

[broncobowsher]

I'm going to say they will want to swap that out under warranty. I know at one time I held the record for the number of replaced bad NERDs under warranty. But all my stuff was depth sensor issues. It was also the rEvo version as a monitor just for full disclosure. But that was back in 2018/2019, it has been happy for a long time now.

Does the Choptima version have anything special in it?

 

[Rollin Bonz]

I'm going to say they will want to swap that out under warranty. I know at one time I held the record for the number of replaced bad NERDs under warranty. But all my stuff was depth sensor issues. It was also the rEvo version as a monitor just for full disclosure. But that was back in 2018/2019, it has been happy for a long time now.

Does the Choptima version have anything special in it?

That's what I'm guessing as well. Hopefully they'll send out a replacement prior to me sending mine in, so as to minimize my downtime and inconvenience

They'd ask that I send in the dive log files, but since the dives in question are failing to import, I am unable to provide them. I don't know how much diagnostic info they can glean from the info I am able to provide.

I don't have anything to compare it to. First rebreather, first Nerd. Just the splash screen maybe?

 

[Rollin Bonz]

I'm going to say they will want to swap that out under warranty. I know at one time I held the record for the number of replaced bad NERDs under warranty. But all my stuff was depth sensor issues. It was also the rEvo version as a monitor just for full disclosure. But that was back in 2018/2019, it has been happy for a long time now.

Does the Choptima version have anything special in it?

By the way, I think I hold the record for most replaced parts in a single Perdix AI repair (not under warranty unfortunately), I think the only thing that was salvaged from my damaged unit was a gasket for the screen or bevel.

 

[Rollin Bonz]

Update:

Turns out even though the dives in question do not show in the dive log in the Shearwater cloud desktop, the LOG FILES Shearwater requested WERE there. So I sent them in.

They reviewed them and found them weird and wanted to investigate them further.

After initially reporting the issue via email and having some back and forth, it ended up being about 6 weeks of them not responding to my emails. I was starting to get a bit perturbed, so I called them . My emails were evidently going to someone's spam folder. Once I got them on the phone, they were Johnny on the spot.

According to one of their software engineers...

"opinion is that it looks like there was a data corruption issue in that log, but that it may be an isolated incident. He suspects that it was the result of an incorrectly cleared section of the flash where the log is stored. If it happens again, or if it has happened since you first reported the issue, you should send in the NERD for service."

When I reminded them it had already happened twice, about a month apart, they decided I should send it in for a replacement. I have about three weeks to a month of no diving planned around Christmas and New Years, so I'm sending it to them in a week or so. Hopefully I can get one more weekend of diving in before I do so.

So the one thing I learned is, if they aren't answering your emails, they may not be getting them. Just pick up the phone and call them.