Your boiler has detected that waste water produced during operation is not draining away properly, which is causing it to shut down to prevent damage.

condensate level high

What causes this fault?

This fault occurs when the boiler's internal computer experiences a brief communication error or a glitch during its standard operating sequence. It is often triggered by a minor fluctuation in the power supply or a temporary sensor misalignment that the boiler tries to fix itself. In most cases, the system is simply performing a self-check to ensure all components are safe before continuing to provide heat.