CodeRegistry
Brands
  1. Home
  2. Vaillant
  3. Turbomax Plus Boilers
  4. F.22
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.

F.22

F.22 — Insufficient Water in System (Ecomax Pro 828E)

Vaillant · Turbomax Plus Boilers

What does F.22 mean?

This fault code indicates that the Ecomax Pro 828E boiler has detected a critically low water level or pressure within your heating system.

Common Causes

  • Insufficient water in the system
  • Low system pressure

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check your boiler's pressure gauge; if it's too low (e.g., below 1 bar), repressurize the system according to your boiler's manual.

  2. 2

    Look for any signs of water leaks in your heating system or around the boiler.

  3. 3

    Restart the boiler after ensuring adequate pressure.

  4. 4

    If the problem persists or pressure drops quickly, contact a qualified heating engineer to find and fix any leaks.

Browse all codes in this manual (55)
Verified technical data. Last updated: April 2026

Related Faults

F.00F.00 — Flow NTC Cable Defective or Broken (Turbomax Plus)F.00, F.04, F.05, F.10, F.14, F.15F.00, F.04, F.05, F.10, F.14, F.15 — NTC Sensor Fault (Ecomax Pro 828E)F.01F.01 — Feed Temperature Sensor (NTC) Fault or Open Circuit (Turbomax Plus)
Source: Vaillant Turbomax Plus Boilers
Open Manual (Page 2)Search more codes in this manual