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Thanks for the quick reply! So does that mean there's a problem with my boiler?

what does the symbol mean though? why has it suddenly appeared for the first time in 3 years?! how do i get rid of it?

Hi guys All of a sudden my thermostat is showing the symbol that is in the pic below: Now, despite having it set at 20 degrees, it wont heat up past 14 degrees ,which is the highest temp that the symbol shows up on! Does that make sense? I'm probably being really thick but i...