BioLife Stirling Ultracold ULT25NEU, Operating Manual, Page: 18 / 34

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OPERATING MANUAL
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ULT25NEU
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10.05.22 TABLE OF CONTENTS
4.4 OVER-TEMPERATURE ALARM
If the freezer compartment temperature is 10ºC warmer or colder than
the Setpoint for five seconds then it will go into temperature alarm mode.
> The Over Temp LED will turn on (this is used for under temperature
alarms as well).
> The freezer will make a double beep every 10 seconds.
> Situations which can affect the freezer’s ability to maintain a steady
state or cooling rate include:
– The lid is ajar
– The air vents are blocked
– Addition of a large relatively warm mass
– Power supply problems
–
Mechanical and/or electrical problems.
4.4.1 How to Silence the Audible Temperature Alarm
The Over Temp LED will always be lit when the freezer’s temperature
is over or under the set temperature by more than 10ºC.
4.4.2 To Postpone an Alarm
When the audible alarm is sounding it can be postponed.
Press the
Temperature Preset – 3
button (located directly beneath the
Over Temp LED ) and the audible alarm will be turned off for 1 hour.
4.5 ERROR CONDITIONS
Certain conditions will cause an Error Code to be displayed on the LCD
display, and the Error LED will be lit.
> The error code will be of the form E ##, where ## is the error code.
See Section 5 for possible error codes.
> The error code will be displayed for about five seconds and then the
display will show the chamber temperature. The Error LED will stay on.
> The error code can be recalled by briefly pressing the Temperature
Preset – 2 button, located directly under the Error LED . This will recall
the error code for approximately 10 seconds.
> If the Temperature Preset – 2 button is pressed and held for five seconds
(three beeps) this will clear both the LCD display and the Error LED.
However, if the error condition persists the error cycle will start over again.
4. OPERATION
(continued)