worcester greenstar 30 he staying on low rate

[fabio]

i have recently been to a job where the worcester 30he had not been used for 6 months,I changed the fan as fault code c1
was comming up and it seemed fine.few days later the boiler is staying on what seems to be low rate CH water not getting above
50 degrees.any ideas guys.cheers

 

[SimonJohns]

These boilers have many parameters on the installer menu

Phone Worcester when on site to make sure it's calibrated correctly