I totally drained the water from my Adria Matrix Supreme with Aldi heating. Now although I can hear the pump working with tank showing 25% full, no water coming through. The illuminated panel also at first showed 'OFF' then after a while 'ON' then a countdown for some reason, still no water coming through. I tried pouring water back down the shower hose, it went with just a few bubbles but still nothing from the pump to taps. Any ideas please!