Helmer Scientific i.Series
®
Ultra-Low Freezer
Service and Maintenance Manual
360173-A/C
35
Problem
Possible Cause
Action
Both compressors running.
Check cascade temperature - touch i.C
3
settings (user password) / device
status and history - Cascade temperature maintaining below -20ºC BUT
greater than -50ºC. Normal. Allow to stabilize.
Cascade temperature -50ºC or colder. Oil logging. Defrost unit. Low stage low on
charge. Contact Helmer Technical Support to utilize tech service thermocouples.
6.3
Alarm Activation Problems
Problem
Possible Cause
Action
The freezer is in an alarm
condition, but alarms are not
audible.
Audible alarms are muted.
Verify that audible alarms are not muted. If time remaining is greater than five
minutes, change MUTE timer value to five minutes and wait until timer resets.
Check alarm volume level and tone selection. Touch i.C
3
Settings (enter
password) / Sound Settings.
i.C³ control board is faulty.
Confirm the control board is operating correctly. Replace if necessary.
Speaker is faulty.
Replace display assembly.
A component is faulty or internal
connections are loose.
Contact Helmer Technical Service.
The freezer meets an alarm
condition, but the appropriate
alarm is not active.
Alarm setpoint was changed.
Check the current setpoints for the alarms.
A component is faulty or internal
connections are loose.
Contact Helmer Technical Service.
The High Temperature alarm
activates when the door is
opened, then clears shortly
after the door is closed.
High temperature alarm setpoint is
set too low.
Check the setpoint and change it if necessary.
Connections for the chamber
temperature sensor are loose.
Check the sensor wire connection to the control board and secure the
connection if necessary.
A component is faulty or internal
connections are loose.
Contact Helmer Technical Service.
The freezer is connected to
power, but the AC Power
Failure alarm is active.
Outlet connection is faulty.
Verify power at the outlet. Repair the original outlet or connect to a different
outlet if necessary.
Power cord is faulty.
Confirm the power cord is connected securely. Secure the power cord if
necessary.
ON/OFF AC power switch is faulty.
Replace the ON/OFF AC power switch.
ON/OFF AC power switch is OFF.
Switch the ON/OFF AC power switch ON.
A component is faulty or internal
connections are loose.
Contact Helmer Technical Service.
Circuit breaker is tripped.
Reset the circuit breaker.
Circuit breaker is faulty.
Replace the circuit breaker.
Power supply board is faulty.
Replace the power supply board.
Power filter is faulty.
Replace power filter.
The Door Open alarm is
activating sporadically.
Exterior door is not closing completely.
Confirm the hinges are not damaged. Replace the hinges if necessary.
Exterior door is closing but not
sealing completely.
Defrost the exterior door gasket.
Connection for the exterior door
switch is loose.
Test the switch wiring connection and secure the connection if necessary.
Exterior door switch is faulty.
Replace the magnetic door switch.
i.C³ control board is faulty.
Confirm the control board is operating correctly. Replace if necessary.
Door Open Timeout is set to zero,
causing the alarm to activate
immediately when the door is opened.
Check the time delay for the Door Open alarm. Change the time delay if
necessary.
