Eppendorf New Brunswick -86 °C Freezers Innova U360 - Manual (Page 35)

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Innova® U360 -86 °C Freezers — Operating manual
8 Troubleshooting
8 Troubleshooting
8.1 General errors
If you are experiencing a problem with your freezer, check the following troubleshooting guides
before contacting your New Brunswick authorized Service technician.
8.1.1 Safety alarms
The system is designed to prevent the user from accidentally turning the alarm system off. The
system will trigger the temperature alarms if the freezer temperature is outside the alarm
temperature setpoints when any of the following occurs:
• Initial System Start-up
• Mains/Power Failure (then return to operation)
• Temperature Setpoint Change
The alarm can be muted until the freezer returns to within the alarm setpoints.
8.1.2 Mains/power failure
If mains/power cannot be restored in a timely fashion, the audible alarm and controller/display
power can be permanently disabled by opening the lockable mains/power switch cover plate and
physically placing the battery alarm switch in its off position. This will also shut down all data
recording.
8.1.3 Inner doors
The upright freezers are fitted with internal doors which latch shut, minimizing temperature rise
when the outer door is opened. Inner door gaskets require the door to be latched at all times
when the freezer is running in order to be effective. Failure to latch the inner doors properly will
lead to ice buildup between the outer and inner doors, and under the inner door seals. The inner
doors can easily be removed and de-iced via their lift-off hinges. Make sure they are thoroughly
dry before returning them to service.
8.2 Error messages
Your electronically-controlled New Brunswick freezer incorporates a microprocessor-controlled
system to troubleshoot, diagnose and report faults and problems in its electronic and refrigeration
systems. The system uses plain language where appropriate to describe the problem and
suggest corrective actions.
This table interprets error codes that may appear in the control panel display:
Symptom/
message Cause Remedy
Door will not
open • The door handle is locked.
• The heated vent port is
blocked.
 Unlock the door handle.
 Break up the ice in the vent port using the
hand bolt (see Heated vent port on p. 31).
If the door will not open:
 Call New Brunswick Service.
More than
one voltage
stabilizer
LED lights
up • Voltage stabilizer may have
failed.  Call New Brunswick Service.
No voltage
stabilizer
LED lights
up • Voltage stabilizer may have
failed.  Call New Brunswick Service.
8
Troubles
hooting