The short answer
What you are seeing on a Summit Professional dishwasher most often comes back to the machine out of level in its cut-out, with a loose hose clip or a split hose behind it. Work the order below rather than the price list: the cheap causes here are also the common ones.
What you are seeing
- Water on the floor at the front of the door — Escaping past the door seal, or running down the inside of the door and out under it.
- A wet patch under the machine that appears after a cycle — Coming from the sump, the pump or a hose connection rather than from the door.
- NEAR MISS: water inside the machine at the end of a cycle — That is drainage, not a leak.
What it usually turns out to be, in order
- The machine out of level in its cut-out — Tilted forward, the water line in the base sits against the door rather than below it, and it leaks on every fill. First on Summit Professional because a flush-set unit is levelled once at install, and the cabinet keeps whatever error was built in that day.
- A loose hose clip or a split hose — The fill and drain connections are under the machine where nobody looks, and a clip that has relaxed weeps slowly. Second here: water that cannot leave comes back, and it comes back somewhere you did not choose.
- A dirty or hardened door seal — The gasket seals on a thin lip. Food residue on it, or rubber that has gone hard, opens a path at the bottom corners. Third: a seal fails gradually, so the symptom arrives long after the seal stopped being good.
- A failed pump seal or a cracked sump — Water arrives under the machine with nothing visibly wrong above it, and it only appears while the pump runs. Bottom of the list on purpose: a pump either moves water or it does not, and a partly working one is the hardest version to spot.
Check in this order, and why
- Check the machine is level side to side and sits very slightly back — An install fault reads as a seal fault from the front.
- Dry everything under the kick plate, run a cycle and look again — A dry test is the only way to place a slow weep.
- Run a finger right around the seal and look at the bottom corners — Residue and a flattened corner are both visible and both fixable.
The checks you can do yourself
- Level the machine in its cut-out and check the door closes square against the frame — A machine that has been pulled out and pushed back is often left tilted.
Tools: a spirit level, an adjustable spannerAbout 25 min
- Take the kick plate off with the power isolated, dry everything, run a short cycle and watch — Watch, do not reach. The point is to see where the first drop forms.
Tools: a screwdriver, paper towel, a torchAbout 30 min
- Wash the door seal and its channel with hot soapy water and check it sits proud all round — Replacing a seal is often unnecessary once it has been properly cleaned.
Tools: a cloth, hot soapy waterAbout 15 min
- STOP HERE: a pump seal or a cracked sump needs the machine out and stripped — A service call, not an owner check.
Before you open anything
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 seal is clean, the loading is sensible, the machine is level and it still leaks, or as soon as you find water reaching a socket or the cabinet floor. Isolate the power at the breaker before taking the kick plate off, and shut the supply tap before disturbing any connection.
Where to go next in this class
What is deliberately not on this page
This page is about the Summit Professional dishwasher as a class rather than one family or model line. Where a family-specific page exists it is linked below and it is the better answer. Not here: seal part numbers, sump diagrams and family-specific torque figures.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
