On May 18, 1:50 am, Matt wrote:

GE chest freezer, 6 years old, something like 19 cubic feet,
model FCM7DRBWH.

The temperature runs to -15 to -10 degrees F when I have it on the
warmest setting, which is to say it is colder than what I want, namely 0
degrees.

GE distributed manuals with most of its freezers, perhaps
all. The manual for GE's current 19 cu.ft. suggests max.
operating temperature is 23 Fahr. i.e. several degrees below
0 Celsius. When interior temp. rises to 23F an alarm light
switches on. Your model is likely to be similar.

--
Don Phillipson
Carlsbad Springs
(Ottawa, Canada)