https://fixbroken.ru/oshibka-f61-kotla-vaillant/#:~:text=%D0%9E%D1%88%D0%B8%D0%B1%D0%BA%D0%B0%20f61%20%D1%81%D0%B2%D0%B8%D0%B4%D0%B5%D1%82%D0%B5%D0%BB%D1%8C%D1%81%D1%82%D0%B2%D1%83%D0%B5%D1%82%20%D0%BE%20%D0%BD%D0%B5%D0%BA%D0%BE%D1%80%D1%80%D0%B5%D0%BA%D1%82%D0%BD%D0%BE%D0%B9,%D1%81%D0%B2%D1%8F%D0%B7%D0%B0%D0%BD%D0%B0%20%D1%81%20%D1%8D%D0%BB%D0%B5%D0%BA%D1%82%D1%80%D0%BE%D0%BD%D0%BD%D0%BE%D0%B9%20%D1%87%D0%B0%D1%81%D1%82%D1%8C%D1%8E%20Vaillant.
Здесь глянь.