Your boiler's computer cannot communicate properly with the internal pump, usually because it doesn't recognize the specific model or there is a software mismatch.

Incorrect pump type detected

What causes this fault?

This fault happens when the boiler's main control board loses its digital connection with the internal water pump. The most common reason is that the pump's internal electronics have failed or the wiring between the pump and the main computer has become loose or damaged. Without this constant digital 'handshake,' the boiler stops for safety because it cannot confirm that water is being moved around your system correctly.