CodeRegistry
Brands
  1. Home
  2. Vaillant
  3. ecoTEC pro Boilers
  4. Ignition problems
About·Privacy·Terms

CodeRegistry — Your global library for technical solutions.

For your safety: always follow the equipment manufacturer’s official manuals. CodeRegistry is an independent help site and is not affiliated with the brands listed here.

Ignition problems

Ignition problems — Boiler fails to ignite due to unpurged gas tank

Vaillant · ecoTEC pro Boilers

What does Ignition problems mean?

The boiler may experience ignition problems if the liquid gas tank was not properly purged during the system installation. This prevents the boiler from starting correctly.

Common Causes

  • Liquid gas tank not purged properly during installation

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    First, contact the person in charge of filling the gas tank to address the purging issue.

  2. 2

    Verify the information on conversion to liquid gas in section 10.9 of this manual.

  3. 3

    Ensure that the gas tank has been correctly prepared for use.

Browse all codes in this manual (45)
Verified technical data. Last updated: April 2026

Related Faults

F.00F.00 — Flow temperature sensor interruptionF.01F.01 — Return temperature sensor interruptionF.10F.10 — Flow NTC short circuit
Source: Vaillant ecoTEC pro Boilers
Open Manual (Page 7)Search more codes in this manual