Baxi Boiler Error Codes

Written by Stephen Day

Gas Safe Engineer

Guides

Updated: 6th February, 2026

The complete guide to what each Baxi boiler error code means and how to fix it!

How to Reset A Baxi Boiler
Baxi Boiler Fault Codes
Baxi EcoBlue Boiler Error Codes
Other Boiler Fault Codes

Is your Baxi boiler not working and displaying an unusual error code on its screen?

Worry not as these codes can be a great indication of what it is that is wrong with your boiler, helping either yourself or an engineer to know what needs to be done in order to fix it!

In this guide, we will be explaining what each Baxi fault code means and how to fix it.

Need a new boiler?

Get a quote in 60 seconds, fitted as fast as next day!
0% APR finance available.

Get a quote

How to Reset A Baxi Boiler

To begin with, it’s important for you to know how to reset your Baxi boiler model as this can often be the fix for many smaller issues.

The way in which you reset your boiler depends on what type of button or switch it has.

Reset Button

If your Baxi boiler has a dedicated reset button, simply press it until your boiler resets itself and the pilot light relights.

Sometimes, your boiler may lock out. This can be identified by the RED Lockout light constantly illuminating or flashing. In this case, simply hold the reset button until the red light goes away.

Boiler Thermostat Control Knob

If your boiler has a boiler thermostat control knob, turn it fully anticlockwise and then turn it back to your desired setting.

ON/OFF/SELECTOR Switch

If your boiler has an ON/OFF/SELECTOR switch, open the pull down panel and turn the selector switch to R (Reset) and hold for at least 5 seconds before releasing.

Now let’s jump into what each boiler error code means and how you can fix it.

Baxi Boiler Fault Codes

Baxi Platinum Boiler Error Codes

Fault Code	Issue	How to Fix
E20	Central heating NTC error.	Your boiler will likely lock itself out. Call out a Gas Safe Registered Engineer to take a look.
E28	Error with the NTC, flue, air pressure switch or a blocked flue or condensate pipe. - Usually caused by a frozen pipe.	Turn your boiler off at the control panel and turn off the electricity at the wall. Locate the frozen pipe and warm it with either a hot water bottle or warm water poured from a watering can (NOT BOILING WATER) Turn the power back on and restart your boiler.
E50	Hot water NTC error.	Call out a Gas Safe Registered engineer to replace the hot water sensor and seal.
E110	Overheating error.	Bleed your radiators. If the issue persists, call out a Gas Safe engineer to check for blockages in the system.
E119	Low pressure.	Top up your boiler pressure. If the issue persists, call out a Gas Safe engineer.
E125	Circulation fault caused by low pressure.	Top up your boiler pressure. If the issue persists, call out a Gas Safe engineer.
E130	Flue operation error.	Check the outside flue terminal isn't blocked by a bird, or trees etc, and clear it if it is. If the issue persists, call out a Gas Safe engineer.
E133	Frozen condensate pipe.	Turn your boiler off at the control panel and turn off the electricity at the wall. Locate the frozen pipe and warm it with either a hot water bottle or warm water poured from a watering can (NOT BOILING WATER) Turn the power back on and restart your boiler.
E160	Fan system fault.	Call out a Gas Safe engineer to check fans.
E193	Pre circulation fault.	Call out a Gas Safe engineer to check the heat pump or heat exchanger for blockages.

Baxi EcoBlue Boiler Error Codes

Fault Code	Issue	How to Fix
110	Overheating error.	Bleed your radiators. If the issue persists, call out a Gas Safe engineer to check for blockages in the system.
117	Water pressure too high.	Bleed your radiators. If the issue persists, call out a Gas Safe engineer to check for blockages in the system.
118	Water pressure too low.	Add water via the filling loop. If the pressure drops again, call out a Gas Safe engineer.
125	Circulation fault caused by low pressure.	Top up your boiler pressure. If the issue persists, call out a Gas Safe engineer.
133	Safety time to establish flame exceeded.	Ensure that the gas supply has not been turned off and reset your boiler. If the issue persists, call out a Gas Safe engineer.
E10	Outside sensor error.	Call out a Gas Safe Registered engineer to check the outside sensor.
E20	Central heating NTC error.	Your boiler will likely lock itself out. Call out a Gas Safe Registered Engineer to take a look.
E28	Error with the NTC, flue, air pressure switch or a blocked flue or condensate pipe - usually caused by a frozen pipe.	Turn your boiler off at the control panel and turn off the electricity at the wall. Locate the frozen pipe and warm it with either a hot water bottle or warm water poured from a watering can (NOT BOILING WATER) Turn the power back on and restart your boiler.
E54	Hot water sensor error.	Call out a Gas Safe Registered engineer to replace the hot water sensor and seal.
E79	Water pressure sensor and/or pump defective.	Call out a Gas Safe Registered engineer to check the water pressure sensor and/or pump.
E100	Internal clock time error on printed circuit board. (PCB)	Call out a Gas Safe registered engineer.

Other Boiler Fault Codes

Have you got a Viessmann, Worcester Bosch, Alpha or Ideal boiler and aren’t sure what the fault code means? Worry not! We’ve also created guides to the most common codes for all of these brands.

Check them out below:

For more advice and guidance when it comes to your home heating, check out our helpful blogs or get in touch with our friendly team at iHeat today!

Get a quote

Last updated: 6th February, 2026

Written by Stephen Day

Gas Safe Engineer at iHeat

Stephen Day is a Gas Safe registered and FGAS certified engineer with over 20 years of hands-on experience in the heating, cooling, and renewable energy industry, specialising in boiler installations, air conditioning, and heat pump systems.

Articles by Stephen Day are reviewed by iHeat’s technical team to ensure accuracy and reliability.