Bosch SHX43C05UC/46 starts (hums), but the water cycle does not start.

The loud humming noise can be due to the pump sticking if a piece of debris gets trapped in it or an intermittent fault on the pump capacitor or starter relay.

Check out these links below to get tutorials and advice on how to clean the pump or change the capacitor or relay which is cheap and simple job. How to replace Dishwasher pump Bosch Siemens etc Dishwasher Repair Manual Table of Contents http://www.ukwhitegoods.co.uk/help/fault-codes/dishwasher-fault-codes.html?start=25
I hope this helps

I have been told to replace the timer which I am looking to do the same to my machine!

There is a recall on the control board of many of these models, butyour problem is likely not related. It sounds like a plugged drain system or a possible bad drain pump. That's why you are hearing the pump running constantly. I have written a guide to help. It is here. Thanks!

Replace the fill valve that sound is it trying to open

hi there your dishwasher has gone into flood protection mode ie. water has leaked into the base and activated the float switch.

to try and locate the leak tip your d/w back to drain the water from the base then remove both side panels and start a program to see if you can see where the water is leaking from, being careful not to touch anything while the d/w is running as live parts are exposed

hope this is of some help

Make sure that the drain hose is connected as per manufacturer instructions, and that there isn't a direct run down from the sink u-bend to the machine. The rinse agent effects dishes dry but has nothing with the water remaining in the machine. Good luck!

if no drain, then no cycle. problem is probably that draining is not taking place. check the following: if plumbed in under the sink, remove drain hose from spigot and check no blockage. start any program - all programs start with drain. listen carefully for a low humming noise. if you hear this, it means you have something stuck in the pump impellor - bit of bone, cocktail stick etc. get back to me if you like with what you find

humming noise suggests a foreign object in the pump. crack open filter and drain water into a shallow tray. repeat till empty. remove filter completely and clean it. check if something stuck in pump impellor. this should be visible by looking into the filter hole