Mend > Home Heating Systems

Worcester Bosch Greenstar 24i No Hot Water?

Hot water has stopped working.
Heating works fine.
Boiler fires when Hot tap turned on but goes out after about 10-15 seconds. No fault lights appear.
I've taken the front cover off to check for flue problem and it runs exactly the same, i.e. burner lights initially and then stops.
I've also checked and the condenser pipe is clear of ice.
Ideas please.

Paul
January 2010

Bosch Greenstar Heating, Home Heating Systems Bosch Greenstar Working

Fixed!!!
Thanks Wayne.
I noticed that the pressure in the CH loop increased when the hot tap was on so seemed to me the diverter must be stuck.
I gave the diverter valve a donk with a hammer (very technical) and hey presto hot water.
I'd been away for 4 weeks so it must have stuck in position.
Thanks again

Paul
January 2010

Hello again Wayne.

Just thinking that as the water is running through the HW tap as fast as normal how would it not be going through the Heat Exchanger quickly enough?

Also could the diverter be stuck and the very hot water from the CH be getting in to hot water system and causing shut down?

Also surprised that no fault lights come on!

Paul
January 2010

Thanks Wayne.

Is there a way to check this as opposed to just changing the part?

Paul
January 2010

hi it sounds like your domistic heat exchanger the water is not getting through it quick enough to heat up then the boiler detects this and shuts the bioiler s down to save damage, if it runs fine on heating then that where your problems lies

wayne the plumb
January 2010