My niece has a problem with her combi boiler. It heats the radiators fine, but does not fire up when she opens a hot water tap.
The boiler is:
Worcester Bosch Thermo-Technique 24CDI Gas Combi Model AOF.
She only moved into her flat a few weeks ago and is not sure how old the boiler is. She says it looks quite new (I haven't seen it yet, but guess I soon will :-)
I assume there is some device (flow switch?) that senses the demand for hot water and turns the boiler on. I guess there is also some 'overheat' cutout device.
Can anyone suggest what the problem might be?
TIA