BoilerFaultCodesTechnical description
No Water Flow, through Outdoor Unit, 10 times in succession
What causes this fault?
This fault occurs when the system detects that there isn't enough water moving through the outdoor unit to safely transfer heat into your home. The most common reasons are a blockage in the pipework, air trapped in the system, or a circulation pump that has seized up. Because the unit has failed to start ten times, it has locked itself out to prevent the internal components from overheating or freezing.
This issue often appears at the start of autumn when the heating is turned back on after a long summer break, as internal pump parts can become stuck during periods of inactivity.
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.