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F.00

F.00 — Flow NTC Cable Defective or Broken (Turbomax Plus)

Vaillant · Turbomax Plus Boilers

What does F.00 mean?

This indicates a problem with the flow Negative Temperature Coefficient (NTC) thermostat cable in your Turbomax Plus boiler. The cable may be defective, broken, or have a faulty connection.

Common Causes

  • Defective Flow NTC cable
  • Broken Flow NTC cable

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check all visible cable connections to the boiler's NTC sensor for any looseness or damage.

  2. 2

    Restart the boiler by switching it off and on at the main power supply.

  3. 3

    If the error persists, contact a qualified heating engineer to inspect or replace the NTC cable.

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

Related Faults

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)F.1F.1 — Lack of Gas, Ignition, or Flue Fault (EcoMax Pro)
Source: Vaillant Turbomax Plus Boilers
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