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A high-pitched whistle usually means water is passing through a narrow, unstable, or partly blocked path. The restriction may be in the nozzles, inlet screen, flow control, hose, valve, or pipework. Find where the sound begins before replacing the shower head.

Turn the water to a moderate flow. Press the button through its full travel and note which nozzle zones stay active. Clean the external nozzles and the inlet screen only as the product manual allows. If the button still sticks, fails to return, or sends water through two modes at once, stop forcing it. The sealed selector or return mechanism may need service or replacement.