Baxi E107 fault code explained
If your Baxi boiler is showing E107, the manufacturer describes the fault as “PCBs not synchronised”. In plain English, the boiler’s electronic control boards are not working together in the way the appliance expects, so it may stop operating to protect itself.
E107 is not a pressure warning and it is not the same as Baxi E109, E110 or E125. The number matters: write down the complete code exactly as it appears before arranging a repair.
What does Baxi E107 mean?
PCB stands for printed circuit board. A modern boiler can use electronic boards to manage and monitor different functions. With E107, Baxi’s current fault-code reference says those boards are not synchronised.
The display cannot tell you which part is at fault, and it does not prove that a particular board must be replaced. A communication or synchronisation fault can only be assessed properly with the boiler’s exact model, service information and test results. That is work for a suitably qualified engineer; removing the casing or touching internal wiring is not a homeowner task.
Which Baxi boilers can show E107?
Baxi groups E107 with a range of established combi and system boilers. Baxi-branded examples on the manufacturer’s current reference include:
- Baxi Platinum Compact Combi
- Baxi Duo-tec Compact Combi and Duo-tec Combi
- Baxi Megaflo Compact System and Megaflo System
- Baxi 600 Combi and System
- Baxi 800 Combi and System
- Baxi Assure Combi and System
- Baxi Platinum Combi and Platinum+ Combi
- Baxi EcoBlue Combi and System
Code sets vary by generation. If the model name or code format on your appliance is different, use the user guide for that exact boiler rather than assuming E107 has the same meaning across every Baxi product.
Can I clear E107 myself?
There is no safe external adjustment that resynchronises boiler control boards. You can check that the home has power and that the boiler’s display is on, but do not remove the case, disconnect the appliance, disturb wiring or try to access the electronics.
If your exact Baxi user guide gives a normal reset instruction, you may follow it once. Do not keep resetting the boiler if E107 returns. Repeated resets do not repair the underlying fault and can erase useful information about when the problem occurs.
What should I note before booking a repair?
- The full model name from the front panel or user paperwork.
- The exact display: E107, not a similar-looking code.
- Whether heating, hot water or both stopped.
- Whether the code appeared after a power interruption or other recent work.
- Any unusual smell, sound, leak or repeated loss of power.
These details help the engineer prepare, but they do not replace an on-site assessment.
Is E107 dangerous?
E107 is an electronic control fault, not a message that confirms a gas leak. Even so, a boiler that has stopped on a fault should not be opened or bypassed. Keep the casing closed and use a Gas Safe registered engineer for work on a gas boiler.
If you smell gas, suspect carbon monoxide, or a carbon monoxide alarm sounds, do not wait for a routine boiler visit. Leave the property if necessary, call the National Gas Emergency Service on 0800 111 999, and follow the emergency advice you are given.
What will the engineer do?
The engineer will confirm the exact model and code, check the appliance’s electrical supply and relevant connections, and test how the boiler’s controls are communicating. The repair depends on what those checks show. E107 alone is not enough evidence to name a failed part or promise a specific replacement.
Get your Baxi E107 fault fixed
Book Incredaboil’s fixed-price boiler repair for a clear route to getting the fault put right, without attempting unsafe work inside the appliance.