HVAC control unit issues

[Matt B]

I occasionally have random ssues with my air conditioning. Such as

- system spontaneously falls back to "default" mode (24?C, AC on, all on "Auto", etc)
- system won't react to pushing any control unit buttons
- led flashes with no noticeable impact or failure code set
- led flashed with low refrigerant failure code but AC blows ice cold
- led flashed with low refrigerant failure code and no AC operation. Battery disconnect fixes the issue and AC works fine again with no codes

I suspect that the HVAC control unit has issues.
Is there a fix such as swapping capacitors as you normally do on Bose the various Bose components?

Or will swapping the whole unit be the way to go?

I'd prefer a fix as my unit ist like new...