Alpha InTec 30C, 34C Error 20: Flame sensing fault

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

Fault code20

The flame sensing fault code 20 indicates a problem with detecting the flame or failing to open the gas valve after detection. The manual's first action is: “Check flame sensing electrode and lead PCB fault”

Model
Alpha InTec 30C, 34C
Display shows
Flame sensing fault (20)
Type
Fault code
Source
Manual p. 42

What 20 means

Flame sensing fault p. 42

Common causes

  • False flame detection p. 42
  • Flame detected but gas valve is not open p. 42

What to do

  1. Check flame sensing electrode and lead PCB fault p. 42

If 20 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 20; 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.