Hi,
I have boiler mate 2 in my house ,but there is no hot water coming out and the radiators working for half an hour and some times bit long,boiler mate green light is always on and outer surface and copper pipes are hot and hearing some water boiling noise.what causes
This problem,anyone could help me

Circulation issue. Bleed all radiators and check for flow. You may have a stuck check valve or bad circulator.