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Baxi Boiler Fault Codes

Your Baxi boiler is one of the most technical appliances in your home. It is also one that you may take for granted until something goes wrong.

Luckily, boilers are clever enough to provide clues to the problem in the form of fault codes. Here we run through them all and what they mean.

What does my Baxi Boiler Fault Code mean?

Baxi boilers can give us with a lot of information through their fault codes, helping professional engineers get a head start when undertaking a repair.

Fault code Fault


Central heating NTC fault


Flue NTC fault, air pressure switch fault, blocked flue, blocked condensate or wiring fault


Hot water NTC fault


Your boiler made have overheated - try bleeding your radiators


Water pressure too low


Circulation fault (primary circuit) - try bleeding your radiators


Flue NTC operated


Interruption of gas supply or flame failure - gas supply fault


Fan or fan wiring Fault


Pre-circulation fault

What is NTC?

An NTC or ‘Negative Temperature Coefficient’ is a type of thermistor (or thermal resistor).

Basically, it’s an electrical component that helps to regulate the temperature of your boiler. So, when you set your heating to a certain temperature it will make sure your boiler stays at that temperature.

Baxi Boiler Safety Warning

When your Baxi boiler error codes or fault lights flash, don’t do any repair work that involves working with gas as you are required to be Gas Safe Registered by law.

Here at Boiler Plan all our engineers are Gas Safe Registered and will do an amazing job with any Baxi boiler repair work you may need.

Protect your Baxi Boiler with a Care Plan

There are a whole host of possible faults to be mindful of when it comes to your combi boiler. Which is why it’s best to be protected should anything unforeseen happen to your own heating system.

With our range of affordable care plans, there’ll be no need to fluster should you see a fault code.

Whatever plan you choose, each comes with an annual service to ensure your system is fully maintained and ready to keep your home reliably warm

Choose from:

  • Service PlanBoiler service every year to ensure it’s working correctly
  • Gold PackageIncludes: 3 call outs per year, annual service, carbon monoxide test.
  • Platinum PackageIncludes: Unlimited call outs, all parts and labour, repairs to the entire heating system, £500 towards a replacement boiler.
  • Boiler Plan Plus Package - For those with a Boiler still in warranty. Includes: Unlimited call outs, all parts and labour, repairs to the rest of your entire heating system.
Take out a care plan

Cosy up with a better boiler company

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