The symptom pattern

The washer switches on, the motor clearly runs, but when you squeeze the trigger lever almost nothing comes out — or the jet surges and dies instead of holding steady. It’s an unsettling fault because the motor sounds fine, which makes it easy to assume the pump itself has failed. Einhell’s own fault table says otherwise: every cause it lists for this is on the water side, not inside the pump.

What Einhell’s own table says

Section 12’s “Possible causes of failure” table gives a short, specific list for “the motor starts but there is no pressure build-up”: the water intake filter is clogged, there’s an air intake somewhere in the water inlet, the discharge nozzle is too large, or the water cock itself is closed. A separate row for “the operating pressure is irregular” gives one cause — again, air drawn in through the water inlet — with the same remedy as above: check the supply hose and its connectors, and replace them if they’re not sealing properly.

The intake filter check has its own short procedure elsewhere in the manual (Section 8.2.1): unscrew the coupling for the water inlet hose from the machine and clean the exposed inlet sieve under running water. Einhell is explicit about why this matters — a clogged filter “could jeopardize operation of the pump” if left unchecked, which is as close as the manual comes to saying the fault can get worse if ignored.

Working through it

Start with the tap, since it’s the fastest thing to rule out — the fault table treats a closed water cock as a direct cause, not just something to glance at. Then clean the intake filter using the Section 8.2.1 procedure, since that’s the first cause listed for the exact symptom of a running motor with no pressure. From there, check the supply hose and its fittings for a loose or poorly-seated connection that could be drawing in air, and only then look at the nozzle itself for damage or the wrong size.

Verdict

Every cause Einhell lists for this fault has a straightforward owner-level fix, and none of them route to a service centre. Work through the tap, the filter, the hose connections and the nozzle in that order, and most cases resolve at the first or second step. There’s no reason to assume the pump has failed before ruling out the water side first.