What to do if Endress+Hauser Switch does not switch?
- AAndrea BarnesAug 12, 2025
If your Endress+Hauser Switch isn't switching, first check the connection and ensure the supply voltage is correct. This should resolve the issue.

What to do if Endress+Hauser Switch does not switch?
If your Endress+Hauser Switch isn't switching, first check the connection and ensure the supply voltage is correct. This should resolve the issue.
Why is the alarm LED flashing on my Endress+Hauser Switch?
If the alarm LED on your Endress+Hauser Switch is flashing, it could be due to the ambient temperature of the electronics being outside the permitted range, or the connection to the probe being interrupted. Check these two potential causes to resolve the issue.
What to do if Endress+Hauser Switch has an internal fault?
If your Endress+Hauser Switch has an internal fault, it indicates that the device is defective.
What to do if the DC PNP output is overloaded on Endress+Hauser Switch?
If the DC PNP output of your Endress+Hauser Switch is overloaded, reduce the connected load to resolve the issue.
What to do if calibration points are outside the measuring range on Endress+Hauser Switch?
If the calibration points of your Endress+Hauser Switch are outside the measuring range, recalibrate the device.
What to do if Sensor DAT (EEPROM) data are invalid on Endress+Hauser Switch?
If the Sensor DAT (EEPROM) data are invalid on your Endress+Hauser Switch, perform a download from the electronic insert.
What to do if the calibration point is too close to the measuring range limit on Endress+Hauser Switch?
If the calibration point on your Endress+Hauser Switch is too close to the measuring range limit, reduce the switch point or select a new installation location.
What to do if Endress+Hauser Switch probe is not detected?
If the probe is not detected by your Endress+Hauser Switch, it may be incompatible. Use a Liquicap M probe.
| Brand | Endress+Hauser |
|---|---|
| Model | Liquicap M FTI51 |
| Category | Switch |
| Language | English |
Provides detailed ordering information for the Liquicap M FTI51 model.
Provides detailed ordering information for the Liquicap M FTI52 model.
Details wiring steps for common housing types F16, F15, F17, and F13.
Specific wiring instructions for the FEI51 electronic insert (AC 2-wire).
Specific wiring instructions for the FEI55 electronic insert, including SIL capabilities.
Describes the operation interface, function switch, keys, and LEDs for specific electronic inserts.
Describes the operation interface, DIP switches, and LEDs for FEI53 and FEI57S inserts.
Guides the commissioning process for electronic inserts FEI51, FE152, FEI54, and FEI55.
Details how to set the measuring range for the device.
Explains the step-by-step process for performing an empty calibration.
Explains the step-by-step process for performing a full calibration.
Guides users on how to perform fault diagnostics on the electronic insert.











