Why is my heat-pump dryer showing a clean-filter light after cleaning?#
When the filter warning stays lit even though you have just cleaned it, the usual reason is that you put the filter back while it was still wet, so it clings to fine lint and the machine still reads airflow as low. That reminder tracks how freely air moves, not simply whether you have opened the flap, so anything still restricting flow keeps it glowing. The ranked table below lists the rest: a filter not pushed fully home, which still registers as blocked; a condenser that also needs attention, because many models watch total airflow; and, on some machines, a prompt that simply needs resetting in the menu once the work is done. All four are quick to put right yourself.
Showing a clean-filter light after cleaning: likely causes, ranked#
The airflow reminder has not cleared because a filter is still restricted, misfitted, or the condenser also needs attention. You will clean the filter, restart, and still see the clean-filter reminder glowing.
| Likely cause | What's happening | How likely | First thing to check | Fix it yourself? |
|---|---|---|---|---|
| A filter refitted while still wet | a damp filter clings to lint and keeps airflow low, so the reminder stays lit | Most likely | let both filters dry fully before refitting them | Often DIY |
| A filter not clicked fully home | a filter left proud of its slot still reads as blocked | Most likely | push each filter in until it seats and locks | Often DIY |
| The condenser also needing a clean | many models watch total airflow, so a fouled condenser keeps the light on | Possible | rinse the condenser fins as well as the filters | Often DIY |
| A reminder that needs acknowledging | some models hold the light until it is reset in the menu | Less likely | follow the manual to reset the clean-filter reminder | Often DIY |
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Safe checks to try first#
Work through it in the order the machine senses airflow. First, take both fluff filters out and let them dry fully before refitting, because a damp mesh holds onto lint and keeps flow low even when it looks clean, which is by far the commonest reason the warning lingers. As they dry, make sure each one then goes back until it clicks home, since a filter left proud of its slot still registers as choked. Next, remember that many models judge total airflow, so a fouled condenser holds the light on however clean the mesh is; open the base flap, rinse the heat-exchanger fins, and let them dry too. Finally, check the manual, because some machines keep the prompt lit until you clear it in the menu even after the air is flowing freely. If you have dried and reseated the filters, washed the condenser, and reset the prompt and it still will not go out, that is worth a technician checking the airflow sensor rather than more cleaning.
When to call a technician#
Clearing a stubborn filter warning is almost entirely owner maintenance. Drying the mesh before refitting, seating each piece until it clicks, rinsing the condenser, and resetting the prompt in the menu are all straightforward jobs needing only water and a few minutes. A technician becomes necessary only in the rare case where the air is genuinely clear, every filter and the condenser are clean, dry, and properly seated, the prompt has been reset, and the light still refuses to die. That points to an airflow sensor or a control fault reading a blockage that is not there, which needs testing rather than another wash. So do the drying, reseating, condenser rinse, and reset first; only if a genuinely clean, well-fitted machine keeps the warning lit is it time to call someone to check the sensor.
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Common questions#
Why is my heat-pump dryer showing a clean-filter light after cleaning?#
Usually the filter went back while still wet, so it clings to lint and the machine still reads airflow as low. One not pushed fully home, a condenser that also needs rinsing, or a prompt that needs resetting do the same. Dry and reseat the filters, wash the condenser, and reset the reminder to clear it.
Could a filter refitted while still wet be the cause?#
Yes, and it is the most common one. Damp mesh holds fine lint and keeps flow restricted, so the warning stays lit even though the filter looks clean. Let both pieces dry fully before putting them back.
Does a filter not clicked fully home explain it?#
It can. One left slightly proud of its slot still registers as blocked. Push each piece in until it seats and locks properly, and the machine should recognise the clear airflow.
Should I check the condenser also needing a clean first?#
Check it if drying and reseating the mesh does not help. Many models watch total airflow, so a lint-fouled condenser keeps the warning on however clean the filters are. Open the base flap and rinse the heat-exchanger fins, then let them dry.
Can a reminder that needs acknowledging do this?#
On some models, yes. The prompt is held until you reset it in the menu, even after the air is flowing freely. Follow the manual to clear it once everything is clean.
Is this a DIY fix or a technician job?#
It is a do-it-yourself fix in nearly every case: dry and reseat the filters, rinse the condenser, and reset the prompt. Only if a genuinely clean, well-fitted, reset machine keeps the warning lit does it need a technician to check the airflow sensor.
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