THIS IS A 2008 MODEL.
I have had air in the system & the boiler now displays F5 & will not start.
I believe there is an overheat re-set switch but can't locate this. The manual shows a thermistor on each of the flow & returns (both are present on this boiler) and the overheat switch is shown between the flow thermistor & the vent valve (but there is no sign of a switch on this boiler)
Could someone help me with locating the switch or is there another method of re-setting for this model?

Robin, November 2009

Wow, I would've froze my ass off if y'all didn't leave these comments. Thanks!

Jeffrey Andreoni, December 2009

ii will re set it self when fault has gone, but the re set switch is on the front by the + - you will need somthing like a pen to push it.

phil, November 2009

it will reset i self but you need to re presure the system first by re filling

phil, November 2009