Triton Biarritz II -No Water Flow - Red Power Indicator Dimly lit?

This is an existing installation; been working fine for atleast 2.5 yrs i have lived in the property. Was working fine until this morning. After using the shower for 15 mins or so, switched it off(standby and then switched-off using the power switch with the pull down string in the bathroom); then back on in about 10-15 mins; the power indicator on the shower panel was dimly lit; when i turned the top knob clockwise to cold water position i get a click sound and no cold water flow happens and also the dimly lit power indicator goes off. This happens for single and double hot water positions as well; the power indicator comes on (dimly -lit) once back to the stand by (flow - off) position. Not sure what might by causing this. Any help would be greatly appreciated. Thanks a lot folks