Our Bosch dish-washing machine (SGS 6902EU/07) is no longer filling in with water, displaying "F" on the led panel. Opening the side panel I see that no water is flowing in from the water mains. The dishwasher is using an Aquastop 's main water inlet valve: this is located at the water mains location, rather than inside the dishwasher.

To determine whether the problem is associated with the inlet valve or with the dishwasher, I measured the voltage across the inlet valve's terminals and it was 0V. I then considered the possibility that the inlet valve was short circuited, so I also measured the voltage with one terminal disconnected. The the dishwasher was turned on, this rose to 2.4V DC. I think this is too low; a manufacturer of such valves gives a 12-220V range in its specifications.

Any idea on what the voltage should actually be? Any suggestions for testing the valve?

  • Bosch error codes seem to be "E1", "E2", etc; not just "F". Mar 20, 2016 at 19:27
  • These are indeed the diagnostic codes. The "F" appears in the normal wash cycle. Mar 21, 2016 at 9:53

1 Answer 1


Inlet valve's are normally the first to go, so I'd stop testing & order that new valve assembly. Other than that, turn off the circuit breaker or perform a reset & see if it's just a temporary fault that blocked it's operation.

  • Indeed, replacing the inlet valve assembly fixed the problem. After removing the valve, I was able to read on its housing that its operating voltage is 230V AC. Also, the valve does not open until 5-10 minutes into the washing cycle. These factors confused my initial diagnosis. Mar 22, 2016 at 20:57
  • Fabulous! I'm glad it worked out & thank you for your question! Your question & the solution that worked will be a big help to others.
    – Iggy
    Mar 22, 2016 at 23:11

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