Helmer Scientific i.Series
®
Ultra-Low Freezer
Service and Maintenance Manual
360173-A/C
32
6
Troubleshooting
CAUTION
• Review all safety instructions prior to troubleshooting.
• Troubleshooting should only be performed by trained refrigeration technicians.
NOTE
To order Replacement Parts, contact Helmer Technical Service (1-800-743-5637).
6.1
General Operation Problems
Problem
Possible Cause
Action
The exterior door does not
open easily.
Exterior door handle bushings are
worn.
Confirm the exterior door handle is firmly attached to the freezer door. Replace
the door handle bushings if the handle is loose.
Excessive frost or ice build-up on
mullion because cleaned or defrosted
gasket and closed while still wet.
Defrost the interior and verify it is dry before closing door.
An interior door does not
open easily.
Frost accumulation around the
interior door gasket.
Defrost the interior door.
Interior door hinge is bent.
Replace the interior door hinge.
Interior door retaining clip is worn
or bent.
Replace the interior door retaining clip.
The monitor display is difficult
to read.
Screen brightness is set too low.
Change the screen brightness. Touch i.C³ APPS, Brightness. Touch the icon
corresponding to the desired brightness setting.
The monitoring system is not
responding.
Digital electronics are locked
because of an interruption in power.
Reset the monitoring system by turning battery and AC power off and back on.
“Refrigeration System” alarm
is displayed on the monitor.
Refrigerant pressure or temperature
is too high due to improper airflow.
Ensure that freezer has been installed with proper clearances.
Check that ambient temperature is in the acceptable range.
Check the air filter and condenser face, and clean or replace as needed.
Check condenser face, clean as needed.
Check the operation of the condenser fan, and repair or replace as needed.
Refrigerant pressure or temperature
is too high because the freezer is
not being used as intended.
Ensure that products being placed in the freezer are pre-frozen to avoid
introducing an excessive heat load.
Refrigerant pressure or temperature
is too high because the low stage
compressor is not operating when it
should be.
Check the status of the low stage compressor. Touch i.C³ APPS, Settings
(enter the Settings password), Device Status. Scroll as needed to view the
compressor status.
Verify CP is initiating SSR2 to be ON by checking that the LED for SSR2 is lit.
Verify control voltage is leaving the SSR2 relay.
Check the line voltage high pressure switch, ensuring switch is closed.
Check the low stage compressor start components.
Refrigerant pressure or temperature
is too high because the high stage
compressor is not operating when it
should be.
Contact Helmer Technical Service.
One or more system components
has failed.
Contact Helmer Technical Service.
“Sensor Failure” alarm is
displayed on the monitor.
One or more of the temperature
sensors has failed, or sensor wiring
is an open circuit.
Check the i.C³ Event Log Detail screen for the specific sensor failure. Touch
i.C³ APPS, Information Logs, Event Logs. Touch the individual event to view
the sensor failure code.
Check the sensor wire connection to the control board and secure the
connection if necessary.
Confirm the sensor is providing resistance in the range of 73 Ω to 110 Ω.
Replace the sensor if resistance is outside of specified range.
