Alpha InTec 30C, 34C Error 27: Insufficient primary flow

Alpha InTec gas boiler · taken from the manufacturer’s manual, pages cited

Fault code27

The system is detecting insufficient primary flow due to rapid temperature rise in the primary sensor. The manual's first action is: “Blocked or restricted primary flow Air in heat exchanger Boiler or heating circuit valve closed Pump fault Primary flow sensor fault”

Model
Alpha InTec 30C, 34C
Display shows
Insufficient primary flow (27)
Type
Fault code
Source
Manual p. 42

What 27 means

Insufficient primary flow p. 42

Common causes

  • Rapid temperature rise of primary sensor p. 42

What to do

  1. Blocked or restricted primary flow Air in heat exchanger Boiler or heating circuit valve closed Pump fault Primary flow sensor fault p. 42

If 27 is still not resolved

The manual gives no further instruction for this code. Open the code table in the PDF or contact Alpha InTec service.

Open the manual at page 42 All 30C, 34C error codes Manual details & download

This page summarises what the manufacturer’s manual says about 27; 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 Alpha InTec. Found a mistake? Report an error.