Your boiler is having trouble communicating with a sensor that monitors its internal water drainage system, which is preventing it from running safely.

condense sensor error

What causes this fault?

This fault occurs when the boiler's internal computer experiences a brief moment of confusion or data interference while talking to its own sensors. It is essentially a software 'hiccup' where the main control board loses its place for a split second and needs to recalibrate. In most cases, it is a one-off event caused by a minor electrical fluctuation or a temporary communication delay within the system.