brittany combi 80 cuts after hot water after hot water is turned off.

[julesverne]

can anyone point me in the right direction
brittany combi 80. central heating works fine.
problem is when you draw hot water ans then turn hot tap boiler cuts out with no lock out light. boiler needs a reset to continue working same thing happens when using hots folled fault finding chart which suggest dhw flow switch so changed it but still same problem.

at the boiler now any ideas?

 

[julesverne]

also to add to this when i turn hot water back on it will fire up but not for central heating

 

[julesverne]

sorted

 

[neily01]

What was probkem then?

 

[mutley racers]

I think I might have the same problem with a vokera. What was up?

 

[julesverne]

just me being a div. when switching between heating and hot water. heating wouldnt fire after demand for hot water had finished for approx 45-60 seconds then it would fire up as normal tried it few times and worked perfectly fine after that. and it did this. i summised it must be part of the cycle it just threw me because there is no pump overrun whilst this is happening and had never worked on one of these before . there was also a problem with water pressure switch but that was a separate issue.