CDA F1 fault codewhat it means and how to fix it
Overflow. CDA tell you to unplug the machine and close the tap — power first, then water, and the order is worth understanding.
Stop — this needs an engineer
Get a qualified appliance engineer to look at your CDA F1
We do not pass enquiries to a repair firm, so there is no form here. When you book a qualified appliance engineer, tell them the make, the model and the exact code or message on the display, and ask whether they carry parts for this make — that is what turns one visit into a repair rather than a quote.
What F1 means
CDA give F1 as overflow, and their instruction is short enough to quote in full: unplug the machine and close the tap, contact CDA customer care. Notice the order. Manufacturers split on it: Miele say close the stopcock then switch off and unplug, and Samsung’s manual says close the valve then switch the breaker off, while CDA and Beko both put the power first — CDA with unplug the machine and close the tap, Beko with cut off the electricity, close the valve.
There is a reasonable argument for either order and it is not worth agonising over on your knees behind a kitchen unit: do both, quickly, and do not stand in the water while you reach for the socket. If you can only do one thing, the tap matters more, because water keeps arriving whether the machine has electricity or not.
What F1 tells you is that water is already somewhere it should not be. That is the past tense, and it distinguishes this from CDA’s other water code, F3, which means water is still coming in. F1 is the aftermath; F3 is the event in progress. Both need the tap off, but F3 is the one to run to.
What causes it
| Cause | What is actually happening | How likely |
|---|---|---|
| Internal hose or joint leaking | Water escaping inside the cabinet and collecting where the machine detects it. Common and often a modest repair. | Common |
| Door seal failed | A perished seal letting water run down inside the door and pool underneath rather than escaping where you would see it. | Common |
| Overfilling from a fill fault | Water arriving in greater quantity than the machine allowed for and going over the tub. CDA publish F3 for the inlet failing open and F5 for the pressure system. | Occasional |
| Sump or tub leaking | A split or a failed seal in the base of the machine. The serious end, and it has to be found before it can be priced. | Occasional |
Can you fix it yourself?
Stop — this needs an engineer
What it costs to fix
Typical repair cost
£90–£280
Around £90 to £170 for a hose, joint or door seal. Sump or tub work runs higher. CDA machines are usually integrated, so add time for getting it out of the run.
Typical UK prices including parts and labour, updated September 2026. Your quote may differ.
Own this appliance and had this code? . Nothing is published until a person has read it.
Related CDA fault codes
- F2Get it checkedCannot discharge water. CDA mention glass shards by name in their own remedy, which is a warning as much as a diagnosis.Related: same brand
- FFGet it checkedWater inlet system failure. CDA want the tap checked and the hose filter cleaned, and both are free.Related: same brand
- F3Stop — call an engineerWater is still coming in and the machine cannot stop it. Close the tap now — this is the one CDA code to act on before reading anything else.Related: same brand
- F7Get it checkedOverheating. CDA publish it as a distinct fault from their two heater codes, which tells you something about what it means.Related: same brand
- F9Get it checkedDivisor position error. The machine has lost track of the valve that decides which spray arm gets the water.Related: same brand
Own a CDA dishwasher? Save it and its codes come first next time.
Related guides
Common questions about CDA F1
CDA say unplug first. Other brands say water first. Which?
Do both and do not agonise over the order. If you can only manage one, make it the tap, because water keeps arriving regardless of whether the machine has power. The one thing not to do is stand in water while reaching for a socket. CDA’s own manual, in a different section, recommends turning off the water supply at the tap and disconnecting the mains whenever the dishwasher is not in use, which is the same pair of actions in the other order.
My CDA shows E1, not F1. Is this my page?
No. E1 belongs to CDA’s other platform — the CDI4100, CDI4200, CDI6100, CDI6200, CDI6300 and CDI6400 — where it means overfill or leakage. CDA’s instruction there is the same in substance: turn off the main water supply before calling for service. The SCD4509 and SCD6011 show the same fault as a flashing ECO indicator. The F-code meanings on this page are for the CDI4121, CDI4251, CDI4320, CDI4420, CDI6121, CDI6132, CDI6241, CDI6242 and CDI6371.
What is the difference between F1 and F3?
Timing. F1 is overflow — water is already where it should not be. F3 is continuous water input — water is still arriving and the machine cannot stop it. Both need the tap closed; F3 is the more urgent of the two.
Can I tip the machine to empty the base?
No. It is the most repeated dishwasher advice online and it is wrong on every brand. It clears the warning without touching the cause, and disables the protection that told you about it.
Can I take the front panel off and look?
CDA are unusually blunt about this. Their manuals state that under no circumstances should any external covers be removed for servicing or maintenance except by suitably qualified personnel. Whatever you think of that in general, a cabinet with standing water in the base is not the place to test it.
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.