Whirlpool dishwasher DWH B10 Drainage fault

[Packstrapper]

Hello, I have a whirlpool DWH B10 dishwasher with a 4 flash drainage fault .The drain pump is working fine as when i run the test cycle i can hear the water go to the sink .I have checked the pulse wheel and i am getting pulses at the plug .I was wondering whether there is a water sensor i have missed but all i can see is what looks like a temperature probe.

Any ideas?Getting desparate ,i am not used to doing washing up

Mike.

 

[zipper]

This part is located in the sump http://www.espares.co.uk/parts?k=481227128556 It is often the cause of an F4 error.
Lie the machine on its back, remove the baseplate. Take out the pressure switch & give it a good clean taking care not to damage the diaphragm behind the grill.

 

[Packstrapper]

Thanks i will take another look at that .I did test the contacts outside the machine but i will test with it installed .I was expecting to find a water sensor rather than a pressure switch .

Mike.

 

[zipper]

These pressure switches often get blocked by bits of sticky labels/fat/residue etc & the diaphragm doesn't switch properly. When it does this the machine "thinks" there is still water inside, thereby causing an F4 error. After cleaning carefully poke a cable tie or something blunt through the grill & check if it switches properly with your multimeter. Be careful not to puncture the diaphragm