Glastender Bar Refrigerator Error Code Err 3: Probe Signal Missing

What does Glastender error code Err 3 mean?

Err 3 shares a row with Err 1 in the troubleshooting table of the Glastender operation manual. The controller uses one temperature sensing probe to know how cold the box is, and Err 3 appears when that input is not working as it should. The manual's definition is brief: it gives the same causes as Err 1 and says that, like Err 1, it usually points to disconnected controller wires. The causes it lists are probe wires disconnected from the digital controller and a defective probe. The actions are also brief. It tells you to reconnect the wires, following the wiring diagram in the operation manual, and to call for service if the probe is defective. The manual does not explain how Err 3 differs from Err 1 in the controller's logic, so we do not either. What can be said is that the controller depends on the probe for cooling decisions, and the code means that dependence has been interrupted.

Affected models and control systems

Glastender bar refrigerators with a digital controller covered by 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

• Err 3 shown on the controller instead of a temperature
• Cooling that does not follow the set temperature
• Warm product, or ice on the evaporator if the compressor runs without control

Possible causes

Listed in Glastender's documentation

• Temperature sensing probe wires disconnected from digital controller
• Defective temperature sensing probe

Other likely causes — what usually sits behind error code Err 3 on this control. A technician confirms which one it is before any part is replaced.

• Controller plug loosened by vibration or by pushing the unit back against the wall
• Probe cable pulled tight when shelving or racks were rearranged
• Damaged probe lead near the evaporator where it is exposed to cold and condensation

Safe checks before calling for service

How a technician diagnoses error code Err 3

1. Confirm the code on the controller and note whether any other message appears.
2. Inspect the probe connection at the controller against the manual's wiring diagram, power off.
3. Examine the probe lead for damage and moisture at the evaporator end.
4. Test the probe resistance with a meter and compare it with the cabinet temperature.
5. Swap in a new probe only when the test fails, then confirm a normal temperature readout.

How error code Err 3 differs from similar codes

Err 1 and Err 3 are grouped together with identical causes in the manual table. The manual describes Err 1 as most often caused by wires unplugged during service and says Err 3 behaves similarly.

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.