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Candy E4 fault codewhat it means and how to fix it

Stop — call an engineerDishwasherCandy and Hoover dishwashers. Protective systems fitted vary by modelLast reviewed

A water leak. Candy specifically warn against tilting or moving the machine, which rules out the fix most often recommended online.

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What E4 means

Candy document E4 in one phrase — water leak — and their general instruction for a breakdown is to switch the appliance off, turn off the water supply, and not tamper with it. What makes this page worth reading rather than skimming is that Candy publish a warning almost nobody else does, and it directly contradicts the most popular internet advice about dishwasher leak codes. Their words: to ensure the correct operation of the overflow safety device, they recommend not moving or tilting the dishwasher during operation, and if it is necessary to tilt or move it, to ensure the washing cycle is complete and no water remains inside. That is the manufacturer saying the anti-flood device depends on the machine sitting level and undisturbed. The widely shared trick for clearing a leak code is to tip the machine onto its back or side to drain the base and drop the float. On a Candy that is not merely unwise, it is the specific action the manual tells you not to take. Candy machines may carry up to three separate protective systems, and which you have depends on the model: WATERBLOCK, a sensor in the sump that closes a valve at the tap end and blocks water even with the tap fully open; AQUASTOP, which monitors the hose itself and shows a red mark in a small window when it has triggered; and a general anti-overflow device that blocks the water flow or drains the excess.

What causes it

Causes of the Candy E4 fault code, most common first
CauseWhat is actually happeningHow likely
Door seal perished or hardenedThe commonest leak on any dishwasher. A seal that has gone hard at the lower corners no longer holds water against the door.Common
Machine not levelA machine that has settled holds water against one corner of the seal instead of spreading it evenly. Candy tie the overflow device’s correct operation to the machine sitting properly.Common
Washing-up liquid used instead of dishwasher detergentProduces far more foam than the tub can contain, and foam escapes seals that handle water without trouble. Free to rule out and free to fix.Occasional
Hose or connection leakingThe inlet or waste hose, or a clip that has slipped. If AQUASTOP has triggered, the window on the hose shows a red mark and the hose must be replaced.Occasional
Tub or sump leakingThe least common and the most serious, needing the machine out and stripped before it can be priced.Occasional

Can you fix it yourself?

What it costs to fix

Typical repair cost

£70–£240

Free if it turns out to be washing-up liquid or levelling. A door seal is typically £70 to £140 fitted. A replacement AQUASTOP inlet hose is £30 to £60. Tub or sump work is at the top of the range.

Typical UK prices including parts and labour, updated August 2026. Your quote may differ.

What other owners found

Nobody has shared what worked for them on this code yet. If you have had it, you would be the first — and it genuinely helps the next person.

Common questions about Candy E4

Can I tip the machine to drain the base tray?

Candy specifically advise against it. Their manual says not to move or tilt the dishwasher, because doing so compromises the correct operation of the overflow safety device — and if you must move it, to wait until the cycle is complete and no water remains inside. Almost every brand has reason to say this; Candy actually write it down.

What is WATERBLOCK and do I have it?

It is a Candy safety system with a sensor in the sump that closes a valve at the tap end, blocking the water even with the tap fully open. Not every model has it. If yours does, it is why no water reaches the machine at all once it has triggered.

There is a red mark showing on my inlet hose. What does that mean?

That is AQUASTOP, and it means the hose safety device has operated. Candy’s position is that once the red mark appears the tube must be replaced. It is not something to reset, and the hose must not be cut or repaired because it contains live parts.

What should I do first?

Turn off the tap feeding the machine and switch it off at the wall. Then check whether anyone has put washing-up liquid in it, because that produces a leak with nothing actually broken and it is the one cause you can resolve yourself.

Written by

Fault Code Check editorial team

Updated

Reviewed by

Appliance technical reviewer

Qualifications to be displayed on appointment

Last reviewed

Sources and how we verified this

We establish the facts from the sources below and then write the explanation ourselves. We do not copy manufacturer wording and we do not host their manuals.

  • Manufacturer technical and service documentation

Checked by Appliance technical reviewer (Qualifications to be displayed on appointment) on 5 August 2026.

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