combi- ok for hot wter, cutting out on call for central heating??

[Simon F]

I am looking at this tommorrow. been getting progressivly worse for a while.
I looked at it about a year ago but it was fine at the time, I cant remember what boiler it is.

when it locks out the fault code led's don't relate to anything in the manual.
Apparently it now locks out about 50 percent of the time when the call is for heating.
if it gets reset and the water is run for a time the heating will then work, at least this is what I have beed told.

diverter valve sticking, open for water??

any ideas of what to look at when I go tommorrow?

 

[wattsie1987]

Diverter/flow switch /throttle/ diaphragm/PCB /blockage/overheat list goes on!

 

[bigads28]

Which boiler is it Simon?

 

[Simon F]

its a halstead finest platinum.
was working fine when I went, will be ongoing.
thinking divertor.