Candy E4 fault codewhat it means and how to fix it
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
| Cause | What is actually happening | How likely |
|---|---|---|
| Door seal perished or hardened | The 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 level | A 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 detergent | Produces 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 leaking | The 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 leaking | The least common and the most serious, needing the machine out and stripped before it can be priced. | Occasional |
Can you fix it yourself?
Stop — this needs an engineer
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.
Related Candy fault codes
- E21Stop — call an engineerWater is coming in when it should not be — the solenoid valve is stuck open. Candy say to close the tap immediately and disconnect the power.Related: flood protection
- E15Stop — call an engineerThe water protection system has activated — there is water in the base of the machine. Turn the tap off and call service. Do not tilt it, whatever else you read.Related: flood protection
- i30Stop — call an engineerThe anti-flood device has triggered — water has collected in the base of the machine. AEG say to close the water tap and call service.Related: flood protection
- F01Stop — call an engineerAnti-flooding overflow. The one code in the Hotpoint list that offers no owner check at all — it goes straight to an engineer.Related: flood protection
- F70Stop — call an engineerThe Waterproof System has activated. Miele give the clearest emergency instruction of any dishwasher manufacturer — close the stopcock, switch off, unplug, call.Related: flood protection
- AEStop — call an engineerLG’s leak code. LG tell you to call for service if it happens again — we think that is the wrong advice and explain why.Related: flood protection
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.
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.