Z-450
Troubleshooting
Problem
Potential cause
Solution
The machine will not
switch on
A. Inadequate voltage or
blown fuse
B. Defective cable
C. Regulator fault
A. Check voltage and fuse
B and C. Contact the Technical
Services Department
The machine will not
commence cooling
operations
A. Set Point too high
B. Fault in regulator
parameters
C. Refrigeration-circuit fault
A. Lower Set Point
B and C. Contact the Technical
Services Department
The machine will not
commence heating
operations
A. Set Point too low
B. Fault in regulator
parameters
C. Heating-circuit fault
A. Raise Set Point
B and C. Contact the Technical
Services Department
The machine’s
compressor or external
casing are too hot
Machine inadequately
ventilated, or exposed to
sunlight or other heat
source
Move machine to another
location
Internal temperature of
the machine and the
temperature displayed on
the regulator do not
match
Internal temperature of the
machine calibrated
incorrectly
Contact the Technical Services
Department
