We have a Worcester 28Si and are now getting no hot water at all.
It started a while ago. The central heating would work for a while then the reset button would flash but we could get hot water from the taps when reset. A few days later the CH would work for a couple of mins and stop. We could get half a bath tub of HW before the reset flashed. A Few days later all we could get was a wash basin of hot water before it broke. Now we are lucky if we get a mug full.
I've checked thee Water flow turbine for debris, the water pump, the airflow pressure switch, nothing. The fan is turning, and i've flushed out the heat exchanger. But still not working.

Can anyone help as the missus is starting to moan.

Martin H, May 2008

Hi
I've taken off the heat exchanger and put water through all ports and could not find any blockages. I've replaced the pump and the new one is nice and quite but i have the same problem.
Can any one help.
Thanks
Martin H

Martin H, June 2008

Thanks Iain

you can here the pump working and when i emptied and refilled the system i could hear the pump working in air as the water got around the boiler. if this means it's strong, i don't know.

I've flushed out the HW side of the heat exchange. Does the CH side need doing?

I've run the boiler for about 30 sec without the overheat thermostat touching the heat exchanger, same problem.

Thanks
Martin H

Martin H, May 2008

overheat problem could be stat but i would of started with weak/dead pump, heat exchanger/system condition

iain, May 2008