I think you are correct on sensor side of things. The plastic mesh is a protector and behind it is indeed a diaphram that when pushed activates a switch. I took it apart and tested it by looking at the signals at the circuit board end and filling it up with water - it seems you only need a fraction of total amount of water in the bowl before the switch activates. This surprises me as I would expect that, to within a small tolerance, it would be the switch that tells the chip that there is enough water in the bowl and to move on to the next cycle. However, when reasembling the eror code has gone away - I presume it was a lose terminal connection. I cannot see/find the optical sensor you talk about - surely I could not have missed it - can you be sure it has one?? The machine is a ADP4501/5WH Now the question is how does it know when it is full of water and what sensor does it look at for the next cycle. I am now back to square one! The same symptoms as a request I entered a while ago. However, I now know what is is not! The situation is now...
- No error code messages
- Press start, green light on permentaly, water drains, water fills, then simply pauses for infinite time with no error codes and the light on. Press start again and it simply drains and stops
- Not a problem with NTC sensor (checked this in situ)
- Not problem with 'pressure' switch (checked this in situ)
I have dismantled and taken my circuit board, motor and heating elements to work and had all the components check by an electrical
engineer and there is nothing obviously broken through testing with a DVM. All the major capacitors and resistors seem fine on the circuit board.
What is the answer???
What I want to know is what happens once the water fills for the first time.
The chip must check which sensors to know that it is ready for next stage in cycle and then what is the next cycle - what component will be activated next. If I knew this I could single out what is broken. I struggling to believe that its so hard to simply find what is broken! Of well,
I will endevour - I'm passed the point of no return now! lol
thanks for your help and time sleepyhead