BoilerFaultCodesTechnical description
Condensate pump level switch activated for longer than 3 minutes - boiler locks out.
What causes this fault?
This fault occurs when the internal tank that collects waste water becomes full and cannot empty itself properly. The most common reasons are a mechanical failure of the condensate pump or a blockage in the thin plastic discharge pipe leading away from the boiler. To prevent an internal flood, a safety sensor triggers and shuts the system down until the water level drops.
This fault is particularly common during freezing winter temperatures, as the external portion of the waste pipe can freeze solid and prevent water from leaving the pump.
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.