CDA F7 fault codewhat it means and how to fix it
Overheating. CDA publish it as a distinct fault from their two heater codes, which tells you something about what it means.
Take care
Get a qualified appliance engineer to look at your CDA F7
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 F7 means
CDA list F7 as overheating, and the useful thing about their table is that they publish it alongside two other thermal codes rather than lumping them together. F8 is a heater error. F6 is a faulty heater sensor. F7 is overheating. Three separate entries covering three different failure modes in the same part of the machine, and the distinction is a real one. A heater error means the water is not getting hot.
A sensor fault means the machine cannot tell how hot the water is. Overheating means the water got hotter than it should have, which is a different and more concerning proposition, because it implies heat was being applied when it should not have been. CDA’s advice for all three is the same — contact customer care — and given their position that no external covers should be removed except by qualified personnel, that is where this ends for an owner.
Two practical things while you wait. If the machine stopped mid-cycle, leave it a while before opening the door, because steam from an interrupted dishwasher scalds. And do not simply restart it to see whether it does it again. A fault that reports excess heat is not one to test empirically in a cabinet under a worktop.
What causes it
| Cause | What is actually happening | How likely |
|---|---|---|
| Heater control fault | The element being driven when it should not be, or not switching off on command. The reading that best fits a code named overheating. | Common |
| Temperature sensor faulty | The machine misreading the water temperature and heating past the target. CDA publish F6 separately for a faulty heater sensor, but the two overlap. | Common |
| Machine plumbed into a hot supply | CDA state in the installation section that the appliance is cold fill only. A hot feed can push the tub past what the programme expected, particularly on a short cycle. | Occasional |
| Control board fault | The board failing to cut the element. CDA publish FE separately for a faulty electronic card. | Occasional |
Can you fix it yourself?
Stop — this needs an engineer
What it costs to fix
Typical repair cost
£110–£250
Typically £110 to £230 fitted depending on whether it is the element, a sensor or the control. Add time for getting an integrated machine 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
- F1Stop — call an engineerOverflow. CDA tell you to unplug the machine and close the tap — power first, then water, and the order is worth understanding.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
- 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 F7
Can I just run it again and see?
We would not. A code that reports excess heat is one of the few worth taking at face value rather than testing, particularly in a machine built into a run of units. Leave it and get it looked at.
Can I open the door?
Give it time. Steam from a dishwasher stopped part way through a hot cycle scalds, and a machine reporting overheating may be hotter than usual. A few minutes costs nothing.
What is the difference between F7, F8 and F6?
CDA publish all three separately. F8 is a heater error, meaning the water is not getting hot. F6 is a faulty heater sensor, meaning the machine cannot tell. F7 is overheating, meaning it got hotter than it should have. That last one is the one to act on.
Could it be plumbed into hot water?
Possible, and CDA’s installation instructions say the appliance is cold fill only. Feel the pipe running to the machine or trace it back. If it is on a hot feed, that is worth telling the engineer before they start.
My CDA shows E6 or E7, not F7. Is this my page?
No. E6 (abnormal heating) and E7 (thermistor open or short circuit) belong to CDA’s E-code platform — the CDI4100, CDI4200, CDI6100, CDI6200, CDI6300 and CDI6400 — and CDA’s instruction for both is to call for service. The SCD4509 and SCD6011 show a heating fault as the Rapid and 90 min indicators flashing together. The F-code meanings on this page are for the other models.
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.