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.
Stop — this needs an engineer
Get a qualified appliance engineer to look at your Candy E4
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What E4 means
Candy document E4 in one phrase — water leak — and the checks they print beside it are, word for word, the ones they print for E3: make sure the drain pipe is not bent, trapped or blocked, the filter is not clogged and the siphon is not clogged. Read that as Candy telling you that on their machines a blocked drain backing up is a leak cause, not only a drain cause. 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 should it be necessary to tilt or move it, to ensure the washing cycle is complete and no water remains inside the appliance. That is the manufacturer saying the anti-flood device depends on the machine sitting level and undisturbed, and that it is not to be tilted while there is water in it. 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 showing E4 — a machine with water in it by definition — that is the specific action the manual tells you not to take. Every Candy dishwasher has an overflow safety device which, in Candy’s words, automatically blocks the water flow and/or drains excess quantities if water exceeds normal levels. Some models add one or both of two more: WATERBLOCK, a sump in the base with a sensor that closes a valve under the tap and blocks water even with the tap fully open; and AQUASTOP, a device on the supply tube that stops the flow if the tube deteriorates and shows a red mark in a small window when it has done so.
What causes it
| Cause | What is actually happening | How likely |
|---|---|---|
| Drain blocked and water backing up | Candy’s own E4 checks: a drain pipe bent, trapped or blocked, a clogged filter or a clogged siphon. Water that cannot leave rises until it finds a way out. | Common |
| 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, a blocked drain 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 September 2026. Your quote may differ.
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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
- E3Get it checkedThe dishwasher does not drain. Three flashes on a machine without a display, and Candy tell you exactly how to count them.Related: same brand
- E2Get it checkedThe dishwasher does not fill with water. Some models show CHECK WATER or NO WATER in words instead of a code.Related: same brand
- E8Get it checkedThe water heating element is not working correctly, or the filter plate is clogged. Candy bundle two very different problems into one code.Related: same brand
- E5Get it checkedAn electronic control fault. Candy group five codes under this one meaning and route all of them to their service centre.Related: same brand
Own a Candy dishwasher? Save it and its codes come first next time.
Related guides
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 during operation, because doing so compromises the correct operation of the overflow safety device — and should it be necessary to move it, to make sure the cycle is complete and no water remains inside the appliance first. A machine showing E4 has water in it, so that condition is not met. Almost every brand has reason to say this; Candy actually write it down.
Candy’s manual lists checks for E4. Can I do them?
Yes — they are the same three as for E3 and none of them involves moving the machine: make sure the drain pipe is not bent, trapped or blocked, that the filter is not clogged, and that the siphon under the sink is not clogged. Do them with the tap off and the machine switched off. If the drain was the cause the code may not return; if it does, or if there is water on the floor or in the base, it is an engineer’s job.
What is WATERBLOCK and do I have it?
It is a Candy safety system fitted to some models: a sump in the base collects any leak and operates a sensor that closes a valve under the tap, blocking the water even with the tap fully open. If yours has it, that is why no water reaches the machine at all once it has triggered. Candy add that the hose with the electrical box on it must not be cut because it contains live parts, and that if the box is damaged you should pull the plug immediately.
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 because the tube has deteriorated. Candy’s position is that once the red mark appears in the window the tube must be replaced. It is not something to reset, and the replacement comes from Candy rather than a plumbers’ merchant.
What should I do first?
Turn off the tap feeding the machine and switch it off at the wall — Candy’s own instruction for a breakdown is to switch off, turn off the water and not tamper. 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.
Technical review
Not reviewed by an engineer
No engineer has read this page. Severity follows what the manufacturer publishes, and we would rather tell you that than let a byline imply a sign-off.
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
This page has not been reviewed by an engineer, and we would rather tell you that than imply otherwise. The severity rating follows what the manufacturer publishes: where they say isolate the appliance and call someone, so do we.