Vaillant ecotec 831 plus?

Following a F22 fault where we had no heating and only cold water from the hot water tap, I topped up the system, but went to far the needle went into the red. I bled the radiators to reduce the pressure and now we get heating but no water at all from the hot tap, but we do get cold water from the cold water tap. what do I need to do to get water from the hot water tap, idealy hot?