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Brand: Siemens
Model Number:IQ500
Main Symptom: Water wont fill into Matrix
What happens & when: Runs, makes all the right sounds, hums, clicks etc. Then stops on 000. No Error codes.
Error Code (if any): none
Parts or tests already tried: Matrix cleaned exhaust water pipe cleaned and sink connection cleaned
Photos / video link:
Siemens dishwasher, model SN45M507SK. I have been troubleshooting a persistent issue where the machine fails to fill with water and aborts the wash cycle after approximately 20–30 minutes, returning to 0:00 with no error code.
Below is a clear, structured summary of the full diagnostic process and findings so far. I hope this helps your technical team quickly identify the underlying cause and advise on the most efficient next steps.
1. Initial Symptoms
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Dishwasher powered on normally but failed to take in water.
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The machine would drain, attempt to fill, then abort early.
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No water entered the sump or wash chamber.
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No error codes were displayed.
2. Actions Taken
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Fully disassembled the left-side water matrix (heat exchanger / labyrinth system).
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Performed extensive cleaning of the serpentine channels, float chamber, and internal pathways.
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Removed significant internal sludge and deposits.
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Verified that water can now pass through the previously blocked snake-shaped channel.
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Reassembled the unit carefully and ensured all seals and hoses were correctly fitted.
3. Behaviour After Reassembly
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The dishwasher now runs significantly longer (20–30 minutes) before aborting.
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Multiple internal sounds are heard: pumps, valves, clicks, and shifting mechanisms.
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Despite these attempts, no water enters the matrix or the tub.
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The matrix remains completely dry during operation.
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The sump remains dry.
4. Current Diagnosis Based on the behaviour, it appears that:
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The inlet valve is opening (audible water movement), but
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Water does not enter the matrix at all, and
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The machine repeatedly attempts to fill before giving up.
This strongly suggests that the flow‑meter turbine (integrated into the matrix assembly) is not receiving water flow. The likely cause is a remaining blockage in the vertical inlet riser feeding the turbine chamber, even though the visible channels of the matrix have been cleaned.
Because the turbine does not spin, the control board receives zero flow pulses and shuts the inlet valve immediately, preventing the machine from filling.
5. Request for Assistance Given the extensive cleaning already performed, I would appreciate guidance on:
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Whether Siemens recommends further cleaning of the inlet riser feeding the flow‑meter.
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Whether the flow‑meter turbine chamber can be serviced or inspected.
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Whether the recommended solution is to replace the entire water matrix assembly.
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Any known service bulletins or common failure patterns for this model.
I am hoping some members may have experience with this specific failure mode and can advise on the most efficient path forward.
Thanks to all that take interest.
Nb. I am an older retiree and cannot carry the unit and drive it to the city to have it repaired. Hence, try to fix it myself. Wrote to Siemens. They were not in the least interested to advise, or help/
Kind regards, Terence
