Worcester 24 CDI fault finding CH

[2005]

I have a Worcester 28CDi and works fine in hotwater mode, but when on heating it doesnt fire up.CH LED is not iluminated,I have changed fuses on the circuit board but still doesnt seem to fire up and CH LED is still not illuminated. Do you think this is anything to do with the circuit board?

 

[corgigazza]

Has it got internal clock as these go faulty.

check operation of room stat and programmer to see if it feeds a signal back to boiler, link out controls also to see if ch starts up.

 

[Slugbabydotcom]

Probably not! The diverter valve sticking is usually the biggest problem with these combi's

 

[corgigazza]

.CH LED is not still doesnt seem to fire up and CH LED is still not illuminated.?

div valve normally fails on hw.

with no led no demand from boiler

 

[Slugbabydotcom]

oops That will teach me not to generalise and to read the question carefully
Click this for PDF file [You want the 3rd one down] http://www.worcesterbosch.co.uk/index.php?fuseaction=literature.detail&con_id=5058&from_id=5029
Looks like fail point D

 

[ChrisR]

Wrong link?

Try http://www.worcester-bosch.co.uk/index.php?fuseaction=literature.detail&con_id=5056&from_id=5029

Somewhat similar, OK. Didn't work first time!

 

[Slugbabydotcom]

Post says:- Worcester 28CDi
Title says:- Worcester 24 CDI fault finding CH

Which one is it 2005

 

[COG]

The only thing that will stop you getting a ch demand is a faulty programmer or room stat depending on what type fitted , if its the internal digital timer unplug it from the board then it should leave the ch on constant if the room stat or link is closed,never had a board give that problem, room stat would be the most likely .