No hot water- Biasi Riva Compact Mk2

TAF

Hi guys

Wondering if any plumbers about with some advice on whats wrong with my combi.... When i open the hot water tap, it comes out stone cold, but the boiler fires up fine and heating starts to warm up!?!

I_have_spoken

Sounds like the diverter valve is stuck, so the boiler can't change from CH to HW heating.

TAF

Any ideas on how to go about checking it?

Lgas

You need a gas safe registered engineer in. You've proven it by saying that the heating pipes heat up instead of the heat going into the hot water outlet pipe. In extreme cases a blocked secondary heat exchanger can also cause this, but either way, it needs a professional on the case.