Phoenix Inverter Smart 1600VA/12 blinking red on 12.2V?

Q&A and troubleshooting
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1

I returned to my cabin after 6 weeks and when I tried connecting to the inverter via bluetooth I could not. It only showed up as a black bluetooth interface box, not the usual blue and did not respond on button presses - no light came on.

I did long-press the button when leaving but usually it wakes up in seconds. Not sure what made it catatonic.

I therefore disconnected the negative lead and reconnected (with a spark!) and now it seemed to have turned on - for a brief second. Now it blinks both green and red. The manual says to reduce voltage (continuous blinking is “high battery” = high DC voltage)! Any clues? Tried unplugging multiple times. No difference.

Worth mentioning:
It has worked fine up until now
I used it to vacuum last time
I turned it off (all lights off) before leaving
The time before that I only put it in stand by mode, but that almost drained the battery, hence why turning off.
There was a spark when I reconnected the negative wire
Last night when I arrived it had 12.2V. Now batteries are charging, so it’s about 12.9V. quite normal range. No difference.

2

Per the manual the blinking is either high or low voltage, as I am not sure if it’s blinking slow or fast :grimacing:
Here’s a video: https://photos.app.goo.gl/gGa6c6vmDY4g5wz26

The voltage IS neither high nor low, though. Been between 12.2 and 13 since arriving.

When disconnecting and reconnecting it will probably show up in Victron Connect, but will only be connectable 1/3 times. Same with the lights: either no lights blinking and unresponsive to button press, or it will show the blinking lights in the video.