Called to above today. When switched on and prog selected it pumps then starts to fill at same time in short bursts, it does this 3 times then pump runs constant. There are no fault codes, ive cleaned the pressure s/w in base, the matrix is spotless. Ive checked continuity to all componets from pcb (pcb has no obvious signs of failure) and meggered heater and motor. Could it be the NTC or reed s/w on matrix ? Help