Questions? comments? suggestions? issues? If you are contacting us regarding an emergency please call our number or message us in the chat box for the fastest response. Call today for your free estimate! All boilers are prone to lockouts from time to time, but this fault has been particularly common with the baxi solo pf and pf over the years. Citric acid is often using for canning as well as bath bombs, so it’s fair to say its usages are rather varied! Removing an.