So first off I’d like to say that i essentially have little understanding of refrigeration.
I didn’t go into the lab for a few days and I returned to the machine shut off the night prior, so I turned it back on and came back to it about an hour or so later to see it still sitting at 14c. Before leaving i had the freezer down to -55 and the volt meter on the unit was reading 242v. Initially i was able to get the freezer down to -76 (its low on refrigerant as it should get to -80) and the volt meter on the unit was registering 232v. i have been told that even though the plaque on the side of the unit reads 208/230v the number on the unit was ok - if this isn’t true please set me straight.
the model of the unit is ufrc1386-7-d12
i can find all of zero info on it for troubleshooting; the closest i was able to find was this:
the temperature failure light has been on - this was due to the temp not being @ the set point (-76) or below the alarm set point (-67) as it went off when it hit the target
the alarm battery light is on but its because the little 12v battery is sulfated and needs to be replaced (or so i believe)
I checked the fuse in the bottom and the “check fuse” light went on when i removed it.
I’m not sure if there are 2 compressors in the unit - a high and a low? - but perhaps a/the compressor has a problem?
maybe there is a refrigerant leak?
what else could it be?
All help is MEGA appreciated, so thank you in advanced