The short answer
Start from a blocked air gap or a missing high loop: on a ThortKitchen dishwasher that is the likeliest explanation for what you are looking at, and a control that never calls for drain is the least likely. Most of this you can settle before anyone is called.
What the symptom looks like
- Standing water in the base at the end of a cycle — The classic version. A small amount in the sump is normal; a covered filter is not.
- The machine stops part-way through and holds water — Drainage is failing mid-cycle and the control is waiting for a level it never reaches.
- NEAR MISS: water only under the machine — That is a leak, not a drainage fault, and it belongs on a different page.
Causes ranked for this brand, likeliest first
- A blocked air gap or a missing high loop — Without an air gap or a loop above the machine, waste water runs straight back in as fast as it leaves. It leads on ThortKitchen: clearance and levelling are set once in the cut-out and never revisited, so airflow is the standing risk.
- A kinked or blocked drain hose — The hose runs behind the machine where it gets crushed against the wall or trapped by a drawer. Second here: water that cannot leave comes back, and it comes back somewhere you did not choose.
- A control that never calls for drain — The machine is behaving correctly to a wrong reading and the pump is never asked to run. Third on this build, because a board decides the behaviour rather than a switch, so a control fault reads as a machine declining to act.
- A blocked filter or sump — Everything the machine washes off collects here. Full, it closes the only route to the pump. Last, and the order is the point: a filter works until it is full, and then it works against you.
What to check first, second and third
- Look at the air gap on the worktop, or at whether the hose rises above the machine — An install fault looks exactly like a pump fault from inside.
- Pull the machine forward and look at the whole run of the drain hose — A kink is visible and costs nothing to correct.
- Once the path is clear and the pump is free, what is left is the control — And that is a meter job.
Owner checks, in order
- Lift the air-gap cover on the worktop and clear it, or secure the drain hose in a high loop — This is an install fault and it never fixes itself.
Tools: a screwdriverAbout 20 min
- Pull the machine out carefully and straighten the drain hose over its whole run — Check the high loop is still in place: without it, waste siphons back.
Tools: a torchAbout 20 min
- Bail the standing water out with a cup, then remove and wash the filter and clear the sump by hand — Glass and bone fragments live here, so look before you reach.
Tools: a cup, a sponge, glovesAbout 25 min
- STOP HERE: testing the pump winding or the control means a meter on live terminals — A service call, not an owner check.
Safety first, and it is not a formality
Safety
Switch the machine off at its breaker or unplug it before removing the kick plate or any panel, and shut the supply off at the stop tap. A capacitor can hold a charge after the power is off. Never defeat the door latch to watch a cycle run: it holds hot water and a spray arm behind it. Water and a live terminal in the same cabinet is the one combination worth being careful about.
When this stops being a do-it-yourself job
Call when the filter and sump are clean, the hose runs free with a high loop, the waste spigot is open and the machine still holds water. Call sooner if you find the pump jammed with glass: clearing that by hand is how people get cut. Isolate the power before reaching into any sump.
Nearest pages of this class
What this page leaves to a more specific one
This page covers the ThortKitchen dishwasher as a class, not one family or model line. Where a family-specific page exists it is linked below and it is the more precise answer. Not here: pump part numbers, hose routing diagrams and family-specific error sequences.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
