Good morning. I have a Bosch Worcester Greenstar 28i Junior. As the fan statrs up the mains power trips out. Is it the fan at fault or could there be another/different fault.

found this on how to reset it hope it helps...

https://forums.digitalspy.com/discussion/2014658/worcester-greenstar-28i-junior-boiler-fault

Bleed it off from the air release on the rads

search for worcester bosch 35 cdi manual choose Greenstar CDI & download the pdf instructions

Try this http://www.worcester-bosch.co.uk/installer/literature/discontinued-product-literature/discontinued-gas-boiler-literature/greenstar-35-he-plus-combi-discontinued-august-2003-literature and select part number
6 720 610 598 download it and follow the instructions. Good luck

Here is your manual , click this link .

https://www.google.jo/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0CCAQFjAB&url=http%3A%2F%2Fwww.salus-tech.com%2Fcache%2Ffilelibrary%2F2159%2Flibrary%2FfileLibrary%2F2013%2F9%2FST620RF-Manual-Version-009.pdf&ei=aqpcVaeKDInhywO-wYG4CQ&usg=AFQjCNG3X7bL7ssC4wjnbJlKP047s85Rrg&bvm=bv.93756505,d.bGQ

Hi, this is Worcester, Bosch Group.

Our technical team can help with enquiries - please call 0844 892 3366.

We look forward to helping you.

this could be a pcb fault call worcesters they have there own fitters who will fix this , they are good fitters and work on these all the time ,

if you go on the worcester bosch web site and contact the service dept they should send one out to you or you may be able to download one from there.

the limit stat could be out of calibration, low water rate, by/pass if fitted may need reculated, could be blocked heat exchanger best of luck

the code is SE saying it needs a service it can be reset go to this link for a pdf file showing how to http://www.worcester-bosch.co.uk/cache/file/239/guide-to-re-setting-the--se--code-on-greenstar-cdi-boilers.pdf