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dig down metre by metre fill with pea gravel Bingo,thats a rough guide but get the pitchure :roll:

had few problems with my combi,pcb board was damaged,Changed it,Then kept blowing fuses on pcb board checked pump,disconected lead from pcb board,to pump,hot water work fine,not blowing fuses now,got second hand pump tested ok,put pump on,and ran,working fine,but dosent appear to shut...