I have a upright freezer in my garage that is experiencing wild swings in temperature - 0 to over 20. I have checked it both via a thermometer and a "vaccine type bottle". The defrost timer was changed last year and not sure if it really fixed the problem. I am thinking faulty thermostat.
All ideas welcome and ideally part numbers as the unit does not seem to have traditional parts!!! :-) Thanks a lot for the help