I have a -80C freezer and it is hovering at -73 and won't go down any further... Set it to -80 still nothing. Cheers

Temp dials are not always accurate to the degree.
What are you freezing?
-73 degrees should be good enough for about anything.

Thanks for the quick reply RickJ... this is a 10,000$ freezer that is accurate to the degree and calibrated every month to the tenth of a degree...
Just thought the symptoms might point me to a trouble shoot path...
Thanks for your time,
Cheers