Vaillant ecoTEC Plus Boiler Fault Code F.00 – NTC Fault - How To Fix

If your Vaillant ecoTEC Plus boiler is displaying the F.00 fault code, it means the boiler has detected a fault with the NTC sensor (Negative Temperature Coefficient sensor). This sensor monitors water temperature inside the system. When it fails, your boiler cannot regulate heat correctly, so it shuts down to protect itself.

This is a common problem our Gas Safe heating engineers in London are called out for, particularly during the busy winter months. Whether you’re in Central London, West London, South London, East London, or North London, Pleasant Plumbers provide same-day boiler repairs to get your heating and hot water back on.

According to the official Vaillant ecoTEC Plus installation manual, Fault Code F.00 means there is an interruption in the flow NTC sensor circuit. Without a working NTC sensor, the boiler cannot safely measure water temperature and will switch itself off until the issue is resolved.

During our boiler repair London call-outs, the F.00 error is usually caused by:

• Loose or damaged wiring to the NTC sensor.
• A failed or worn-out NTC sensor.
• Scale or corrosion affecting the sensor’s accuracy.
• In rare cases, a faulty PCB (Printed Circuit Board).

Unlike the F.22 low-pressure fault, F.00 is not a DIY-friendly fix. The NTC fault involves electrical testing and replacement parts, so it must be dealt with by a qualified Gas Safe registered engineer in London.

The only step a homeowner can try is pressing the reset button. If the code returns, call a professional for boiler repair in London.

A Gas Safe engineer will:

• Test the NTC sensor with specialist tools.
• Replace the sensor if it has failed.
• Inspect all wiring and connections.
• Diagnose the PCB if the sensor isn’t the issue.

Most repairs can be completed in a single visit.

• Book an annual boiler service London to keep sensors and wiring in top condition.
• Fit a magnetic filter to reduce sludge and scale.
• Use inhibitor fluid to protect your system against corrosion.

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The Vaillant ecoTEC Plus Boiler F.00 fault code points to an NTC sensor problem that requires a professional boiler repair London engineer. While you can attempt a reset, this error usually needs parts replaced or wiring checked by a qualified specialist.

📞 Call us on 0800 046 1000 or email [email protected] for same-day service across Central London, West London, East London, South London, and North London.

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