If your Whirlpool bath has been working, but now will not start, it may simply be that the clear air hose that connect between the underside of the button and the pump has come loose.

SOLUTION:
You will need to get to the back underside of the cabin and look under where the button is located. There should be a clear tube connected to the button. The tube also connects into the black housing on the top of the whirlpool pump. If it has come loose, then simply re-attach it.

If the hose comes of frequently, then it may be that there is either some grease causing the tube to work loose, or the tube is a little too stretched.

Clean the inside on the tube and the nipple where the tube fits with suitable Spirit based cleaner, this will remove any grease and ensure a good clean fit.

If you need to cut a little off the tube, then remove only about 1cm and ensure the tube will still reach before doing so.