Delta M70A_263 Error W08: String fault

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

Warning codeW08

There is a string fault due to incorrect DC connector polarity or failed string current monitoring. The manual's first action is: “1. Check the polarity of PV connection 2. Restart DC switch and AC breaker 3. Contact customer service for technical support”

Model
Delta M70A_263
Display shows
String fault (W08)
Type
Warning code
Source
Manual p. 76

What W08 means

String fault p. 76

Common causes

  • 1. Polarity of DC connectors is incorrect 2. String current monitoring function is fail p. 76

What to do

  1. 1. Check the polarity of PV connection 2. Restart DC switch and AC breaker 3. Contact customer service for technical support p. 76

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

If W08 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 W08; 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.