hi common issue with these units
i would call ally hes a samsung engineer - can give free advice and sells the parts to repair
tel 07407 734 204
his ebay listing give you a bit more info
rs21/srs models Item number: 280739526146
rsh1 models Item number: 280645411839
hes just helped us fix our rs21 model that had same issue so i can recommend no probs
gregor
July 2012