EVO HE c22/24 Condensing boiler?

Boiler evo c22/24 HE, hot water inconsistent. Sometimes hot and sometimes just warm. Presently set on full hot but you can bear your hand under it whereas you couln't before.Heating seems ok.ie (dont think its a diverter valve problem but culd be ). No led's lit at any time on the panel so is impossible to identify through fault lights and reset button is constantly in.Could the control panel have suffered a blow causing the reset button to stop in an keep the led's extinguished?(some household items kept in cupboard alongside boier).