Why won't my Aquastream pump turn off?

New installations or following any internal servicing

Check that the on/off control knob is not fitted upside down - this will cause the inside of the knob to be in contact with the pump's micro switches when the flow is turned off. To position this correctly, the flow graphic sticker on the edge of the knob should sit at approximately 5 o'clock with the fin positioned vertically when the shower is turned off.

All installations:

If not due to the above, the issue will be related to the micro switches which may need to be replaced... Check that the loom assembly is fitted correctly over the cartridge as this could cause the micro switches to stick. Check for signs of damage to the micro switches or any signs of water having been in contact with them. The presence of water would suggest a leak from the unit which would need to be investigated further to identify the source of the leak. Check for the switches getting stuck down (the micro switches should click when pressed)