Pub Glasswasher Leaking: Common Causes and What to Do

A leaking glasswasher behind a busy bar is one of those problems that starts small and turns expensive fast. Water on a bar floor is a slip hazard, it damages cabinetry, and if it gets into electrics you’re looking at a condemned machine on a Friday night. Here’s what I check at Teal Farm when the glasswasher starts weeping, and how to decide whether you’re fixing or replacing.

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Door Seal

Nine times out of ten, this is your culprit. The rubber gasket around the door takes a battering — chemical wash cycles, staff forcing the door closed on over-stacked baskets, heat stress over time. Run your finger around the full seal. You’re feeling for cracks, splits, or sections that have gone hard and lost their compression.

A replacement door seal is usually under £20 and fits in ten minutes. Order the exact part number for your machine — generic seals rarely sit flush and you’ll be back to square one within a week. If the seal looks fine but the door itself is warped or the hinges have dropped, you need an engineer. Door alignment problems let water escape at pressure and no seal will compensate for that long-term.

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Overflow and Float Switch

If water is pooling steadily even when the machine isn’t running a cycle, your float switch may be stuck in the open position, letting the machine overfill. Check the overflow outlet inside the wash tank — it should be clear of debris, limescale, and old detergent buildup. A blocked overflow means water finds its own way out, usually through the door or base seams.

Descale the tank thoroughly. In hard water areas like parts of the North East, limescale builds faster than you’d think even with water softeners running. If the float switch itself is faulty, that’s a call to your service engineer rather than a DIY fix.

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Drain Hose

Check where the drain hose connects to both the machine and the standpipe. Jubilee clips work loose over time, especially on machines that vibrate. A split hose or a loose connection at the back will drip consistently during drain cycles and often gets mistaken for a floor drainage issue.

The drain pump rule applies here: if your machine doesn’t have a drain pump — if it relies on gravity drainage alone — you are always one blocked pipe or raised standpipe away from water backing up and leaking through the base. Gravity-drain machines need their hose runs checked regularly and kept short and sloped. A pump-equipped machine actively clears the water regardless of minor hose run issues. When you’re buying, always check the spec sheet for a drain pump.

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Pump Seal

If you’re getting water under the machine during wash cycles specifically, the wash pump seal may be failing. This is a more involved repair. On older machines — anything over five or six years with heavy use — a pump seal failure often signals that the machine is approaching end of life. Parts availability shrinks, labour costs stack up, and you’re never quite sure what’s next.

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When to Replace

If your repair bill is heading toward 40–50% of a new machine’s cost, replace. A reliable commercial replacement that I’d point operators toward is the [Buffalo Undercounter Glasswasher](https://amzn.to/4ukKRuU Solid build, drain pump fitted as standard, straightforward installation, and it handles the volume a busy pub puts through it.

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A leaking glasswasher rarely fixes itself. Diagnose early, act fast, and know when the repair maths stops making sense.

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