Endress+Hauser FMI51, FMI52 Error A 421: Electronics defective

Capacitive level transmitter · taken from the manufacturer’s manual, pages cited

Error codeA 421

Electronics defective on the Endress+Hauser FMI51, FMI52. The manual's first action is: “Switch device off/on; if the error persists, Contact Endress+Hauser-Service”

Model
Endress+Hauser FMI51, FMI52
Display shows
Electronics defective (A 421)
Type
Error code
Source
Manual p. 84

What A 421 means

Electronics defective p. 84

Common causes

  • Electronics defective p. 84

What to do

  1. Switch device off/on; if the error persists, Contact Endress+Hauser-Service p. 84

If A 421 is still not resolved

The manual gives no further instruction for this code. Open the code table in the PDF or contact Endress+Hauser service.

Open the manual at page 84 All FMI51, FMI52 error codes Manual details & download

This page summarises what the manufacturer’s manual says about A 421; each statement links to the page it comes from, and quoted lines are copied word for word. It is not a substitute for the manual or for a qualified installer. ManualLib is not affiliated with Endress+Hauser. Found a mistake? Report an error.