Your boiler's automatic filling system has topped up the water pressure too many times in a short period, suggesting there may be a leak in your heating system.

Maximum number of refills reached

What causes this fault?

This fault occurs when the boiler's Intelligent Filling System detects that it is adding water too frequently to maintain pressure. It suggests that water is escaping from your central heating system, usually through a pipe leak or a faulty component like the expansion vessel. To prevent potential flooding or damage, the boiler stops refilling automatically and shuts down.