Helmer Scientific i.Series
®
Ultra-Low Freezer
Service and Maintenance Manual
360173-A/C
36
Problem
Possible Cause
Action
The Condenser Temperature
alarm is active.
Condenser filter is dirty.
Check the condenser filter. Clean if necessary.
Side panels missing from cabinet
base.
Reinstall side panels to ensure proper airflow across condenser and
compressors.
Condenser fan is not running.
Check the condenser fan wiring connection. Secure the connection if
necessary.
Check power to the fan and electrical connections. If power to the fan, replace
fan. If no power to the fan, call Helmer Technical Support.
Check the CP operation of relay at J42.
Connection for the condenser
temperature sensor is loose.
Check the sensor wire connection to the control board and secure the
connection if necessary.
Ohm out.
Condenser temperature sensor is
faulty.
Check the sensor wire connection to the control board and secure the
connection if necessary.
Check the continuity of the sensor wiring. Replace the sensor if necessary.
Confirm the sensor is providing resistance in the range of 100 Ω to 115 Ω.
Replace the sensor if resistance is outside of specified range.
The No Battery alarm is
activating sporadically.
Monitoring system back-up battery
voltage is low.
Replace the monitoring system back-up battery.
Power supply board voltage is
incorrect.
Contact Helmer Technical Service.
The High Temperature alarm
is activating sporadically.
Chamber temperature sensor is not
calibrated.
Check the chamber temperature sensor calibration. Change the calibration if
necessary.
A component is faulty or internal
connections are loose.
Contact Helmer Technical Service.
6.4 Icing Problems
Problem
Possible Cause
Action
There is excessive ice in
the chamber, on the interior
doors, or on the exterior door
gasket.
Humid air is entering the chamber.
Verify the door is aligned, gap is within spec, closing tightly, and sealing
correctly. Correct issues as necessary.
Check for tears, loose door gasket, or damaged door gasket. Replace if
necessary.
Defrost the chamber, exterior door gasket, and interior doors if necessary.
Exterior door is not closing
completely.
Defrost the exterior door gasket if necessary
Confirm the hinges are not damaged. Replace the hinges if necessary.
Confirm door gaps and alignment are appropriate.
Check door latch to ensure it is securing and remains secure.
Relative humidity around freezer is
too high.
Confirm freezer location meets requirements.
