Worcester I junior 28

[ed209]

H/W won't work unless heating on changed flow switch on info from WB tech still same problem
If you run hw without heating on boiler goes in to rapid flashing red light but it is random sometimes it works
Help please

 

[diamondgas]

You may find that they actually said change flow sensor ed209 Rapid flash with heating working indicated sensor or board fault according to mi's

 

[ed209]

It was the board could see it arcing in the dark