BoilerFaultCodesTechnical description
Power to PCB 41 but burner pressure incorrect or zero
What causes this fault?
This fault occurs when the boiler's internal computer tries to start the heating process but detects that the gas isn't reaching the burner at the correct strength. It is usually triggered by a mechanical failure in the gas valve or a communication error where the control board fails to send the right signals. In some cases, a faulty fan or an external blockage can also prevent the system from reaching the necessary pressure to ignite safely.
This issue can be more frequent during the first cold snap of winter when gas valves that have been idle over summer seize up or external regulators struggle with the increased demand.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.