Worcester Highflow 3.5 boiler - is there an overheat reset?

Hi, any help will be greatly appreciated.
I believe my boiler has over heated and 'cut out'. I can't find a reset button! The instruction sheet suggests I consult my service engineer; is this necesary?
Thanks
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.