Glastender Bar Refrigerator Error Code AtLo: Service Alarm Code
AtLo is a controller code that the Glastender manual lists without a written definition. Its only listed cause is that the refrigeration system needs service, and its only action is to call for service. There is no cleaning or reset step.
Medium: the manual sends this code to service only, and temperatures outside the set range can spoil product.
- Code
- AtLo
- Maker
- Glastender
- Equipment
- Bar refrigeration
- Applies to
- C1SB, C2SB, C1SL, C1SU, F1SB, F1SL with digital controller
What does Glastender error code AtLo mean?
The manual lists AtLo in the digital controller table among the temperature-related alarms. It gives no written definition for it, so the exact trigger and any limit are not stated. The table lists one cause, that the refrigeration system needs service, and one action, to call for service. Read with its companion AtHi, the name suggests the controller is flagging a temperature condition, but the manual does not say which in words and we do not add numbers. What this page can safely say is that the manual does not offer an operator remedy for AtLo. Unlike AtHi, no coil cleaning is listed. That is a useful clue: the manual treats this one as a matter for a service technician rather than for routine upkeep. If the cabinet is behaving oddly, check where the set point is and whether the door is closed, but do not change settings you are unsure about.
Affected models and control systems
Glastender bar refrigerators with a digital controller, Operation Manual OM007: models C1SB, C2SB, C1SL, C1SU, F1SB and F1SL.
Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.
What you may notice
- AtLo appears on the controller
- Drinks or product colder than usual, possibly with frost
- Compressor running longer than normal without the temperature rising
Possible causes
Listed in Glastender's documentation
- Refrigeration system needs service
Other likely causes — what usually sits behind error code AtLo on this control. A technician confirms which one it is before any part is replaced.
- Controller set point changed to a colder value
- A stuck relay keeping the compressor running past the set point
- Defrost not completing, leaving the evaporator iced
- Temperature probe lead out of position so the controller reads wrongly
Safe checks before calling for service
- Check the controller's displayed set point and confirm no one changed it recently.
- Make sure nothing cold, such as a stack of frozen items, sits against the airflow, and that the doors close.
- Check the cabinet temperature with a separate thermometer.
- If AtLo stays, call for service as the manual directs.
- Write down the set point and the thermometer reading to give to the technician.
How a technician diagnoses error code AtLo
- Read the code and the actual cabinet temperature and compare with the set point.
- Confirm the probe reading against a reference thermometer.
- Check the compressor relay and run cycle to see whether the compressor stops when it should.
- Inspect the evaporator for ice and check the defrost operation.
- Fix the cause and observe a full cooling cycle.
- Relay and compressor checks are made on line-voltage circuits behind panels.
- Defrost and refrigerant side diagnosis needs gauges and certified refrigerant handling.
How error code AtLo differs from similar codes
AtLo is the only code in its group with no cleaning step in the manual. AtHi, AC 1 and AC 2 each list a clean condenser coil action; AtLo lists only a service call.
Technical reference
- Document
- Operation Manual OM007: Self-Contained, Side Serviced Coolers and Frosters
- Maker documentation
- Glastender owner support
- Edition
- Rev. 06-01-25 OM007
- Models / control
- C1SB, C2SB, C1SL, C1SU, F1SB, F1SL with digital controller
- Section
- Digital Controller Operation, p. 2, Digital Controller Trouble Shooting Error Codes
- Checked
- October 2026
We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.
Related Glastender bar refrigeration error codes
Should I worry if AtLo shows and the box feels very cold?
Very cold cabinets can freeze drinks or produce. Check contents and call for service.
Can I clear AtLo myself?
The manual gives no reset or clearing step for it. It points to service.
Is AtLo caused by a dirty coil?
The manual does not list that for AtLo. It lists only that the refrigeration system needs service.
Need help with Glastender error code AtLo?
A technician confirms the cause on site and gives you the price in writing before any work starts.