Grant vortex eco oil boiler needs resetting often

[SimonHalstead]

Recently needing to reset the little red button under the black cap on the boiler about 3 times a week. Always serviced annually. How can I stop this?

 

[SJB060685]

Overheat limit stat manual reset correct? If so would suggest either that or the control stat has failed.

 

[Johnnyflow]

Most likely a circulation issue. I would check the circulating pump first and then go from there.