Candy F4 fault codewhat it means and how to fix it
Candy word this one as "Abnormal heating" and give no owner check at all. On a dryer that is the code least worth ignoring.
Stop — this needs an engineer
Get a qualified appliance engineer to look at your Candy F4
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 F4 means
The whole of Candy’s published entry for this code is two words for the fault and four for the fix: "Abnormal heating", and "Contact the customer service." No cause, no check, no reassurance. On most appliances that terseness would just be unhelpful. On a dryer it is the code we would most want an owner to take at face value, because heat behaving unexpectedly is the beginning of the only failure mode in this category that burns a house down.
What sits behind it is the control system detecting a temperature, or a rate of temperature change, that does not match what it commanded. That can happen because the heating side has failed on — a relay welded closed, a control fault — or because the air that should be carrying heat away is not moving, which is the far more common story and is a filter and heat exchanger problem.
From the outside you cannot tell which, and Candy do not offer you a way to. We have not put repair steps on this page, partly because Candy publish none and partly because a fault whose name is "abnormal heating" is not one to experiment with. Cleaning the filter is worth doing on any dryer at any time. Running the machine again to see what happens is not.
What causes it
| Cause | What is actually happening | How likely |
|---|---|---|
| Airflow is restricted and heat is not being carried away | The commonest underlying reason on any dryer. A clogged filter or a heat exchanger packed with lint means the heat produced has nowhere to go, and temperatures climb past what the control system expects. | Common |
| The heating circuit has failed in the on position | A relay that has welded closed keeps supplying the heating side regardless of what the board asks. The machine sees temperature rising when it commanded otherwise, which is precisely what abnormal means here. | Occasional |
| A temperature sensor is reporting incorrectly | The board is only as good as what it is told. A sensor reading high produces this code with nothing actually overheating, and a sensor reading low is more dangerous because the real temperature goes unnoticed. | Occasional |
| A control board fault | The board manages the heating cycle, and a fault in that logic produces heating behaviour that does not match the programme. Less common than the airflow explanation and considerably more expensive. | Rare |
Can you fix it yourself?
Stop — this needs an engineer
What it costs to fix
Typical repair cost
£90–£300
A thermostat or sensor is at the cheaper end and a control board at the expensive one, with the diagnostic visit on top. Candy publish no repair prices, so these are independent market estimates.
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 Candy fault codes
- Safety noticeStop — call an engineerA live UK fire recall covers built-in heat pump dryers under eight badges including Candy and Hoover. Machines modified before August 2025 are still at risk, and the manufacturers do not say so.Related: same brand
- F2Get it checkedThe drain pump or the water level switch. Before you assume the worst, note that a full tank is a separate message on these machines and not this code.Related: same brand
- F7Get it checkedThe motor has faulted, and Candy narrow it usefully: the driver board has either overloaded or overheated.Related: same brand
- F32Get it checkedThe temperature sensor at the condenser outlet has failed. Worth getting right, because F33 is one digit away and is a different sensor in a different place.Related: same brand
- E7Get it checkedFilters clogged, on the Hoover-badged models that use E codes. One of only two codes in that system with an owner fix — and it names a filter most people miss.Related: same brand
- FHUsually simple to fixNot an appliance fault at all — the dryer failed to join your wi-fi. Candy tell you to ring customer service for it, which you almost certainly do not need to do.Related: same brand
Own a Candy tumble dryer? Save it and its codes come first next time.
Related guides
Common questions about Candy F4
Why are there no steps on this page?
Two reasons. Candy publish none — their entire remedy is "Contact the customer service" — and we do not invent steps a manufacturer has not given for a fault they have named abnormal heating. Cleaning the lint filter is sensible maintenance on any dryer and worth doing. Restarting the cycle to see whether it recurs is not.
Is it safe to run it once more?
We would not. Candy’s own closing instruction for their fault table is that if a code returns you should switch off, disconnect the power supply and contact customer service. On a code about heating, on an appliance whose defining hazard is fire, that is the right instinct.
Could it just be the filter?
Restricted airflow is the commonest underlying cause, so possibly. But there is no way to confirm that from outside the machine, and the consequence of guessing wrong on this particular code is not a wasted evening. Clean the filters by all means — Candy’s manual names two, the lint filter in the door and the condenser filter with its sponge insert in the air duct behind it, both to be cleaned after every cycle — and get the fault diagnosed regardless.
Is this connected to the recall?
Not directly. The safety notice concerns an internal short circuit on built-in heat pump models, which is a different mechanism. But if your machine is a built-in heat pump one, check the rating plate for the J7 marking anyway before you do anything else.
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.