WMF Automatic Coffee Machine Error Code 9507: No Water Pressure

What does WMF error code 9507 mean?

Brewing and hot water need a pressurized water supply, and the control checks that pressure is there before it starts. With code 9507, the machine sees no pressure on the water side, so it cannot brew or make hot water, and drinks stop. The owner's manual explains the usual remedy: open the water tap or fill the water tank, and that fixes most cases. The check behind it is straightforward. If the tap is closed or the tank is empty, no water reaches the pump and no pressure builds. A kinked supply hose or a blocked filter produces the same effect. If water is available but the code remains, the water pump and its pressure are the next suspects. Nothing else on the machine changes with this code, which is why the fix often takes seconds once the tap is found.

Affected models and control systems

This applies to the WMF 5000 S+, in both mains-connected and tank configurations, per the WMF 5000 S+ user manual section 8.2.

Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.

What you may notice

• Drinks not starting with code 9507
• Pump humming without water coming out
• Empty tank indicator on tank machines
• No hot water from the spout

Possible causes

Listed in WMF's documentation

• Water tap position
• Water tank level on tank machines
• Supply hose and filter
• Water pump and pressure

Other likely causes — what usually sits behind error code 9507 on this control. A technician confirms which one it is before any part is replaced.

• Tap closed after maintenance work and nobody reopened it
• Tank refilled but not seated, so it does not feed the pump
• Inlet filter screen blocked with scale flakes after a plumbing job

Safe checks before calling for service

How a technician diagnoses error code 9507

1. Read the code and verify the tap, tank and hose.
2. Measure inlet pressure at the machine.
3. Inspect the inlet filter and any pressure reducer.
4. Check the pump runs and builds pressure.
5. Test the pump wiring and supply.
6. Replace the pump or clear the restriction after the test.

Technical reference

Document

WMF 5000 S+ User Manual, 8.2 Error messages and malfunctions p.108-109

Edition

Series 1950 33 4186 6010, 08.2022 (copyright 2018-2022 WMF GmbH; dated 05.08.2022)

Models / control

WMF 5000 S+

Section

8.2 Error messages and malfunctions, pp. 108-109 (error number table); errors 9678/9679/9619 grinder blocked listed on p. 110 (Errors without error message table)

Checked

October 2026

We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.