Record the error code and pressure.
These details help explain the fault without opening the appliance.
Advice
Boiler advice and guidance
Practical guidance to recognise faults and prepare a useful service request.
Do not reset the appliance repeatedly.
Repeated resets may hide useful information and do not solve the underlying cause.
Use the right contact channel.
For a gas smell or suspected carbon monoxide, contact the competent emergency services rather than using a web form.