BoilerFaultCodesTechnical description
Waiting time: Water shortage. Product is in the waiting period of the operation blocking function as a result of low water pressure (temperature gradient).
What causes this fault?
This fault occurs when the boiler detects that heat isn't being moved away from the internal heat exchanger quickly enough, suggesting a lack of water flow. The most common reasons are a failed internal pump, a build-up of sludge blocking the pipes, or a faulty sensor incorrectly reading the system pressure.
This issue is frequently seen at the start of autumn when heating systems are turned back on after a long summer break, which can cause internal pump parts to seize.
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.