Worcester Bosch Greenstar 27-30 i System EF – Central heating boil detect - large delta T despite minimum burner

Central heating boil detect - large delta T despite minimum burner

Worcester Bosch Greenstar 27-30 i System

Cause 349 (Blocking)

Central heating, boil detect. Large delta T despite minimum burner.. The boiler is operating at minimum burner load and there is a greater than 18°C Flow & Return temperature difference.

This code also applies to:

Greenstar CDi Compact Combi

Source: Manufacturer manual (PDF)