Put it back in the freezer so it gets nice and cold and then test it.
hmmm, I would think it could warm quickly once I open the panel. Maybe you're right on the ice water not being cold enough, but that's what another tech suggested. maybe do both, put it right into the ice water immediately when accessing to slow the speed it warms up?
Anyway, WEIRD update on the whole thing.
UPDATE: To test board further, I turned frig off on control (using temp down button), compressor went off. So then I tried forced defrost mode again, this time compressor went off! So then I tried the internal service diagnostic (position #1) again for the thermostat, that now gives an "S" not a "O"!!
So maybe the board is going bad, or maybe it reset/rebooted itself (I don't know if defrosting it manually had some effect, or just from powering off, or unplugging/replugging electrical connectors behind panel?) but it all indicates working normally now. I won't know for sure until it remains frost free - how long would that be, at least a few days? longer? I guess I can check if the heater comes on in forced defrost mode, but that requires getting behind the panel again, easier to just wait and cross my fingers.
Is this unusual for the jazz to seem to reset, do they sometimes do this, is it even possible? Is there a design feature to force a reset/reboot of the Jazz board
in case of future problem? Or is it just on it's way to bad?
Original symptoms were, freezer was working fine, frig warm. Evaporator fan and damper working normally. Excessive frost buildup.