Helmer Scientific i.Series
®
and Horizon Series
™
Freezer - Undercounter
Service and Maintenance Manual
360417/A
35
6.3
Chamber Temperature Problems
Problem
Possible Cause
Action
Temperature display
does not match actual
temperature.
Display temperature needs to be
calibrated.
Follow temperature calibration process.
Probe bottle is empty, or probe is
out of bottle.
Check level of solution in bottle and or insert probe into bottle.
Chamber temperature is too
high/low.
Probe bottle is empty, or probe is
out of bottle.
Check level of solution in bottle and or insert probe into bottle.
Display temperature needs to be
calibrated.
Follow temperature calibration process.
Door was recently opened or
opened for an extended time.
Close door and allow temperature to stabilize.
Condenser coil is dirty.
Clean the condenser coil regularly, removing all dust build up.
Lack of air flow around unit/high
ambient condition.
Check for proper spacing around unit, any foreign objects blocking airflow, and
that ambient temperature is within specification.
Lack of air flow inside of
chamber.
Verify product placement and move products if they block air flow around
evaporator fan, or product hanging over the shelves against back wall.
Temperature setpoint was
adjusted.
Check temperature setpoint and temperature settings. Change to default
settings or desired setpoint.
Control probe is reading too
high/low.
Check control offset setting, adjust if needed.
Unit cooler fan motor
(inside
chamber)
is not running.
Check voltage to the fan motor using schematic, replace fan motor if needed.
Condenser fan motor
(exterior)
is
not running.
Check voltage to the fan motor using schematic, replace fan motor if needed.
Compressor is not running.
Check voltage to the compressor using schematic, replace compressor start
components if needed.
Ice build up in unit cooler.
See entry in
Section 6.4
6.4
Condensation and Icing Problems
Problem
Possible Cause
Action
Excess frost/ice in chamber.
Some frost/ice within the freezer
chamber is normal.
No action needed. Defrost the chamber if needed by turning the freezer off and
leaving the door open until thawed, dry interior with cloth.
Frequent or extended door
openings.
Close the door and defrost chamber if needed.
Chamber is not sealed.
Inspect door seal for damage, replace if needed. Check for wires routed
through the door seal, reroute wires to the available though hole if needed.
Check through holes and ensure they are sealed, reseal if needed.
Automatic defrost cycle is not
working.
Check defrost settings and test defrost cycle to determine issue.
i.Series
