Model ULC Series
06012021ULC,Rev i
Page 47 of 54
10.0 Troubleshooting
1.
Unit connected to power source, display not on
.
a. Verify input voltage at receptacle.
b. On initial startup, qualified electrician or personnel should check the receptacle for
voltage.
c. Check that main circuit breaker, located in the control enclosure upper left corner, is
not tripped.
Reaching inside of the machine section while the unit is energized can be
dangerous. Always unplug the unit and lockout the power supply before performing
maintenance inside of the unit
2. Unit not cooling:
a. Verify at least one of the redundant refrigeration systems are set to AUTO mode. (see
Operation section 6).
b. Verify temperature control set point (Setup screen # 1) is set to the desired level.
c. Verify door is closed. The door switch turns off the internal circulation fan and
refrigeration.
d. Check that the access port is sealed, and there is no moisture infiltration.
e. Check that all circuit breakers inside of the control enclosure are not tripped.
Reaching inside of the machine section while the unit is energized can be
dangerous. Always unplug the unit and lockout the power supply before performing
maintenance inside of the unit