The Baxi E110 fault indicates that your boiler has overheated. As a safety measure, the boiler shuts itself down to prevent damage to internal components.
This leaves you without heating or hot water while the fault is present, but the shutdown protects the boiler until the underlying problem is fixed. Typical signs include:
- E110 displayed on the boiler
- Heating and hot water stop working
- Banging, kettling or gurgling noises from the boiler
If the fault keeps returning, it should be investigated rather than repeatedly resetting the boiler.
If your boiler is showing a different error, see our complete guide to Baxi boiler fault codes for explanations of other warning codes.
- Content Guide
- » Common Causes of a Baxi E110 Fault
- » How to Fix a Baxi E110 Fault
- - Reset the boiler
- - Check the pressure
- - Bleed the radiators
- - Check the temperature sensor
- - Investigate circulation faults
- » When Should You Call a Gas Safe Engineer?
- » How to Help Prevent the E110 Fault
- » Need Help with a Baxi E110 Fault?
- » Frequently Asked Questions
Common Causes of a Baxi E110 Fault
Several issues can cause an overheating fault.
Low system pressure
If pressure falls below around 1 bar, water cannot circulate properly and the boiler may overheat.
Air trapped in radiators
Airlocks reduce circulation through the heating system, making overheating more likely.
Faulty temperature sensor
A failed NTC sensor can report incorrect temperatures and trigger an E110 fault even when the boiler is not genuinely overheating.
Poor water circulation
A seized pump, sticking diverter valve or blockage can restrict water flow and cause excess heat to build up.
Gas supply problems
This is a less common cause than circulation, pump or sensor faults, but combustion problems linked to the gas supply can occasionally contribute to overheating. This should always be checked by a Gas Safe engineer.
How to Fix a Baxi E110 Fault
Start with the simple checks before arranging a repair.
Reset the boiler
Resetting may clear a temporary fault. If the code comes back, there is an underlying problem that still needs attention.
Check the pressure
Look at the pressure gauge while the boiler is cold. The reading should normally be around 1.0–1.5 bar. If it's low, top up the system using the filling loop before resetting the boiler.
Bleed the radiators
If radiators contain trapped air, bleed them using a radiator key to restore proper circulation.
Check the temperature sensor
Loose wiring or a faulty sensor can trigger false overheating warnings. Sensor testing and replacement should be left to a qualified engineer.
Investigate circulation faults
If the pump or diverter valve has failed, professional diagnosis is required.
When Should You Call a Gas Safe Engineer?
Arrange a repair if:
- the E110 fault returns after resetting
- pressure continues dropping
- the boiler overheats repeatedly
- you suspect a faulty pump or sensor
- you're unsure what caused the fault
Repeated overheating can damage components if ignored. If these checks don't resolve the fault, our boiler repair in London service can diagnose and repair the problem safely.
How to Help Prevent the E110 Fault
Regular servicing helps identify pressure, circulation and sensor issues before they cause breakdowns.
Keeping the system at the correct pressure and arranging an annual boiler service reduces the chances of the E110 fault returning.
Need Help with a Baxi E110 Fault?
If your boiler still displays the Baxi E110 fault, don't continue resetting it.
Book a Gas Safe engineer. We'll identify the cause, carry out the repair and get your heating and hot water working again.
Frequently Asked Questions
Is the Baxi E110 fault serious?Yes. It indicates the boiler has overheated and should not be ignored.
Can I reset my boiler?Yes, but only after checking for simple issues such as low pressure. If the code returns, further investigation is needed.
Can low pressure cause an E110 fault?Yes. Low pressure is one of the common causes because it restricts water circulation.
