Book an appointment

Open now until 9pm

0203 763 2682

Gas Safe Register logo

Gas Safe Register

Gas Safe Register is the official gas registration body for the UK, Isle of Man and Guernsey, appointed by the relevant Health and Safety Authority for each area. By law all gas engineers must be on the Gas Safe Register.

Visit the Gas Safe website to verify our accreditation

Which? Trusted Trader logo


We operate to the highest standards, that’s why we’re endorsed as a Which? Trusted Trader.

Get my quote

Baxi Boiler Error & Fault Code Problems

If your Baxi boiler develops a problem try not to panic. The boiler will display an error code that can help you to figure out what the exact problem is. Your boiler will not be experiencing a fault unless the code showing has an E prefix. If the code does not have an E prefix it is not a fault but a status at which the boiler is operating.

Get your quote online

Simply answer a few multiple choice questions about your existing boiler and we’ll give you a fixed price for a new boiler including all parts and installation[28]

In the event of a fault, the status signal for the Baxi status button button will flash red. The most common Baxi fault and operation codes are listed below:

Baxi boiler fault codes

Fault code Possible Fault
E10 Outside sensor error
E20 Central heating thermostat sensor fault
E28 Flue Thermistor Fault
E54 HW Flow sensor fault
E78 Water pressure sensor fault
E100 Internal clock time error on PCB
E109 Poor circulation

Baxi boiler operating status codes

Code Meaning
110 Overheat
111 Maximum limit of flow temperature
117 Water pressure too high
118 Water pressure too low
119 System pressure low (< 0.5 bar)
125 Water circulation fault
127 Legionella protection temperature not reached
128 Loss of flame during operation
133 Safety time to establish flame exceeded
153 Force reset unit unlocked
160 Fan fault
162 Air pressure switch error
164 Ireland: heating flow switch error. UK: Pressure sensor error
166 Air pressure switch fault
270 Dry fire
432 Earth connector error
433 Heat exchanger temperature exceeded (greater than 95 degrees)

Baxi boiler abbreviations

Abbreviation Meaning
LTH Low temperature heating
DHW Domestic hot water
HRU Heat Recovery Unit
PCU Primary Control Unit – Electronic system to control burner function
SCU Secondary Control Unit – Additional electronic system

Please note that if you smell gas coming from your boiler this is extremely dangerous and it is recommended that you open all of your windows, evacuate the premises and contact a Gas safe registered engineer immediately.

Your chance to win a £100 Amazon voucher!

Every month, one lucky winner will be selected at random to receive a £100 voucher.

Simply enter your details below to be entered into our monthly prize draw to win a £100 Amazon voucher.

Your information is safe with us. We will never pass your details on to any third parties. For details of how we look after your personal information, view our privacy policy.

Get in touch with us today

We’re all about the personal touch, so fill in the form below to give us an idea of where you are and one of our local advisors will give you a call back quick-sharp.

0203 763 2682

Simply fill in this form and we’ll call you straight back.

Book your free no obligation quote today.

Tools icon

Service & Repairs

If you know exactly what you‘re after, call the number below

0203 805 4581

Speech bubble icon

Online chat

Chat to one of our customer service champions now with our live chat system

Chat now

[28] Exclusions apply. See

[79] 5% online discount is available to domestic gas and LPG customers who receive an online quote for all boiler brands. £50 additional discount available on all like-for-like system swaps excluding Ideal Logic HE24 and HE30 boilers & Ideal Logic HO12 & HO15 boilers and an additional £100 discount is available on conventional to combi, and combi to conventional boiler swaps. Online discounted price is only available for the duration of the 14-day quote validity which starts from the day the quote was given. Help-Link UK Ltd include a filter as part of your quote as this is highly recommended by the boiler manufacturer as a key component in maintaining boiler health, functionality and may potentially be looked upon favourably by manufacturers when assessing warranty work. This filter can be removed at the customer’s request. Quote also includes a Honeywell CM727 programmable thermostat for all combi boiler installations as this is a legal requirement as part of the Boiler + legislation introduced 6th April 2018, and cannot be removed from the installation unless; it is replaced with an alternative smart thermostat; or another energy saving measure as listed in the Boiler + legislation or if an smart thermostat already exists within the property. Offer is not available to Help-Link UK Ltd or HomeServe employees. This offer cannot be used in conjunction with any other offers. Help-Link UK Ltd have the right to withdraw or change the offer at any time. Online discount is automatically applied when the customer gets a quote using the online quote system at and as long as the customer meets all the above criteria.