Shower pressure pulses

[craig3972]

Does anyone know why my heated shower pump cycles ( high pressure to low pressure)? Does anyone know how to fix it?

[gotta_ski]

I think ours did that on our old boat when we didn't have the valves open enough to provide enough flow.

[blackTT]

Mine did same thing and the hand piece had be button on the back only half pressed in or out. When I turned the shower on it would pulse. But when I pushed the button in it worked fine and when I backed off it again it would pulse. I got a new hand piece and it fixed it straight away