combi hot water problem

[hazy p]

Hi all this is my first thread the hot water on worcester junior 28i combi boiler is only firing up for a few seconds intermittently so therefore no hot water, any advice on how to sort the problem would be greatly appreciated, thanks

 

[Mbear]

How olds the boiler, the reason I ask is there's a few w/Bosch junior models and this fault will be caused by different things on different juniors

 

[hazy p]

I think its 3 or 4 years old as it was put in by previos owners and paperwork was lost in transition

 

[tamz]

You are better getting someone in to have a look.

 

[newbie1]

as a guess mickey mouse install poss a vented before that wasnt flushed and now plate heat exchanger or worse manin heat exchanger sludged..thats a internet diagnosis tough so engineer on site needed

 

[hazy p]

The heating circuit was not getting used at all with the hot weather so I fired it up full for a few minutes and that seems to have flushed both circuits out now the hot water is working again.

 

[newbie1]

aha but where has it flushed the blockage to...my orig diagnosis stands

 

[hazy p]

Everything seems to be working fine now, thanks for all your help and if there is any problems ill let you know , just out of curiosity if the dhw exchanger was slugged wouldn't it show signs at the taps?

 

[newbie1]

no the water going through the exchanger is from the main
the water heating it has to flow through a very thin fin and as such prone to blocking if not properly flushed and inhibitor added

 

[hazy p]

Thanks for that ill take it on board