Baxi Platinum Compact E107 fault code: what “PCBs not synchronised” means

E107 on a Baxi Platinum Compact Combi means the boiler’s printed circuit boards are not synchronised. The control system has detected that its electronic sections are not coordinating as expected, so the boiler stops normal operation. The code needs professional assessment; it is not proof that a particular board must be replaced.

What does Baxi E107 mean?

Baxi’s current manufacturer error-code table gives the exact E107 wording as “PCBs not synchronised”. PCB is short for printed circuit board. These boards help the boiler interpret heating and hot-water requests, monitor operating conditions and manage safe operation.

Synchronisation in this context is about the boiler’s controls agreeing and communicating correctly. It has nothing to do with a household clock, heating timetable or thermostat schedule. When the expected coordination is missing, the boiler can stop rather than continue with uncertain control information.

E107 is a starting point for an engineer, not a complete diagnosis. It does not establish that one board is faulty, that both boards are damaged or that replacement is automatically required. The underlying reason has to be confirmed on the appliance.

Does E107 apply to the Baxi Platinum Compact?

Yes. The manufacturer’s current fault-code information lists the Baxi Platinum Compact Combi in the model group associated with E107. Baxi also identifies the Platinum Compact as a combi boiler, which means it normally provides central heating and hot water directly without a separate hot-water cylinder.

Do not assume the same code has exactly the same meaning on every Baxi product. Record the full name from the outside of the boiler or your paperwork. If the appliance is a different range, use the documentation for that model rather than this guide.

What will the household notice?

You will usually see E107 on the boiler display. Heating may stop, hot water may stop, or both may be unavailable. The code might appear as soon as there is a demand, after the boiler has attempted to start, or when you first check an appliance that is no longer responding.

The pattern is useful to report, but it cannot tell you which internal part is responsible. A cold radiator, a cold shower or a silent boiler describes the result of the shutdown, not the technical cause of the synchronisation fault.

Useful observations before booking a repair

Keep the boiler closed and make a short record of what is happening:

• Photograph or write down E107 and any accompanying display symbol.
• Check whether central heating, hot water or both are affected.
• Note the time the problem began and whether it followed a power interruption.
• Mention any recent service, repair or other electrical work in the property.
• Check whether the boiler controls and other household electrical items have power.
• Look from a safe distance for an obvious external leak around the boiler.

These are observations, not repair steps. Do not open the front casing, test wiring or try to inspect the circuit boards. The compact size of the appliance does not make its internal controls safe for household access.

Will switching the boiler off and on fix E107?

Do not repeatedly power-cycle or reset the boiler. A temporary restart is not evidence that the underlying issue has been repaired, and repeated resets can remove a useful account of how the fault behaves. Use a normal homeowner reset only when the user instructions for your exact appliance explicitly permit it. If E107 remains or comes back, arrange a repair.

A factory reset, installer-menu change or copied online button sequence is not a safe substitute. Those actions can alter settings without establishing why the controls lost synchronisation.

Why an engineer needs to investigate

Control boards, their connections and the tests needed to assess them sit within the boiler. The appliance casing should remain fitted. Gas Safe Register explains that gas appliances must be fixed and serviced by appropriately qualified Gas Safe registered engineers.

The engineer may consider the fault history, recent work, configuration, electrical supply, communication and internal connections, using the correct Baxi technical information. These are possible assessment areas only. E107 on its own does not let anyone responsibly name a failed part.

A correct diagnosis matters because replacing an expensive board without evidence may not solve the problem. It is equally unsafe to assume that a reconnect or software change is all that is required. The engineer must follow the evidence and confirm safe operation after the repair.

What you should not attempt

• Do not remove the boiler casing or control-panel cover.
• Do not unplug, reseat or clean internal connectors.
• Do not test voltage, continuity or communication wiring.
• Do not enter service menus or alter configuration parameters.
• Do not order a PCB simply because E107 is displayed.
• Do not keep resetting the boiler if the code returns.

E107 is not itself a gas-leak message. However, normal gas-safety rules still apply. If you smell gas, suspect a leak or a carbon-monoxide alarm activates, do not investigate the boiler. Get outside and call the National Gas Emergency Service on 0800 111 999. Anyone with possible carbon-monoxide symptoms should move outside and seek medical advice; call 999 for severe breathing difficulty, sudden confusion, loss of consciousness or serious weakness.

Preparing for the repair visit

Provide the engineer with the full model name, E107, the services affected and when the fault first appeared. Say whether there was a power cut, electrical work or a recent boiler visit. A photograph of the closed-boiler display can be helpful, especially if the code is intermittent.

Clear normal access in front of the appliance and keep any user guide or service record available. Do not dismantle kitchen units or boiler panels. If the home is rented, contact the landlord or managing agent promptly and explain whether heating, hot water or both have been lost.

Quick answers

What is Baxi Platinum Compact E107?

The manufacturer defines E107 as “PCBs not synchronised” for the model group that includes the Baxi Platinum Compact Combi.

Is E107 a thermostat timing problem?

No. “Synchronised” refers to the boiler’s internal controls coordinating, not the time, heating schedule or room-thermostat programme.

Does the code mean I need a new PCB?

Not necessarily. E107 does not identify a definite failed part. A qualified engineer must find the cause before deciding what repair is appropriate.

Is it safe to remove the casing?

No. Keep the boiler closed and use a suitably qualified Gas Safe registered engineer for the internal assessment and repair.