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Ask Glowworm >> Fault codef22 / f75fill up or top up your vaillant combi boiler. This sensor is an electronic component which measures the pressure of water which flows through. Ask Glowworm from vaillantgroup.intelliresponse.com This sensor is an electronic component which measures the pressure of water which flows through. When your boiler develops a fault. the printed circuit board (pcb) displays a fault code on the control panel. Return heating temperature sensor fault :