Lainox EVAPORATOR PROBE

What does Lainox EVAPORATOR PROBE mean?

The EVAPORATOR PROBE alarm reports a fault on the evaporator temperature probe, handled the same way as the cell probe error but applied to the evaporator. The controller loses the evaporator temperature reading, so defrost (unbrining) timing falls back to a fixed parameter and evaporator-fan logic tied to that probe stops working. The alarm relay is activated until the probe is repaired.

Symptoms

• EVAPORATOR PROBE alarm message appears on the controller.
• Evaporator temperature reading is missing or implausible.
• Defrost (unbrining) runs on a fixed time rather than ending on temperature.
• Evaporator-fan behaviour tied to the probe no longer responds.
• The alarm relay output is activated.

Common causes

• Faulty or out-of-range evaporator probe.
• Damaged or broken probe wiring.
• Loose or corroded probe connection at the controller.
• Incorrect probe-related parameter setting.
• Abnormal evaporator temperature outside the probe's valid range.

Diagnostic steps

1. 01

   Apply the cell-probe checks to the evaporator probe

   The manual states the solution is the same as the cell probe error but applied to the evaporator probe: check the relevant probe parameter, the probe integrity, the connection, and the temperature.

2. 02

   Inspect the evaporator probe integrity

   Examine the probe for physical damage or a failed sensing element and replace it if defective.

3. 03

   Check the device-probe connection

   Inspect and reseat the wiring and terminals between the evaporator probe and the controller for loose or corroded contacts.

4. 04

   Confirm defrost behaviour restores

   After repair, verify defrost timing returns to normal probe-based control rather than the fixed parameter d3 fallback and that the alarm relay has reset.

When to call a professional

If the evaporator probe, its wiring, and configuration check out but the alarm persists, have an authorised technician test or replace the probe and inspect the control board. With this fault, defrost runs on a fixed time set by parameter d3 and parameter F1 has no effect, so prolonged operation can cause icing or poor performance; arrange qualified service if the condition does not clear.