Vaillant Boiler Repair F75 & F76 April 29, 2021 Vaillant Boiler Repair in West Bromwich. Called out to a boiler with no hot water or heating due to an F75 & F76 fault code on a Vaillant EcoTEC pro 28 boiler this morning, quickly diagnosed and repaired by replacing a faulty water pressure sensor. All up and running again, with a very happy, and warm customer.