Delta M70A_263 Error F74: Ext COMM. Fault

Solar inverter · taken from the manufacturer’s manual, pages cited

Warning codeF74

The external communication connection has been disconnected. The manual's first action is: “1. Check the connection between external unit and COMM 2. Contact customer service for technical support”

Model
Delta M70A_263
Display shows
Ext COMM. Fault (F74)
Type
Warning code
Source
Manual p. 76

What F74 means

Ext COMM. Fault p. 76

Common causes

  • The external communication connection is disconnected p. 76

What to do

  1. 1. Check the connection between external unit and COMM 2. Contact customer service for technical support p. 76

Before you service the product, read the safety instructions in the manual p. 28.

If F74 is still not resolved

  • contact service / dealer p. 28
    “In order to ensure the normal long-term operation of the inverter, please follow the procedures in Section 5.1 to open and close the door.”
Open the manual at page 76 All M70A_263 error codes Manual details & download

This page summarises what the manufacturer’s manual says about F74; 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 Delta. Found a mistake? Report an error.