Why is my heat-pump dryer ending the auto cycle too early?#
On an auto or sensor programme, the usual reason a load finishes while still damp is a thin film on the moisture-sensor strips inside the drum. Those two little metal contacts judge dryness by touch, and a coat of softener or limescale makes them report a dry load early, so the run stops short. The ranked table below covers the rest: a very small load that seldom brushes the contacts, a conductive softener film carried on the fabric itself, and mixed weights, where thin items read dry while towels are still wet. None of these is a breakdown, and each clears with a wipe of the contacts and a rethink of how you fill the drum.
Ending the auto cycle too early: likely causes, ranked#
The moisture sensor is reading the load as dry before it is, so the auto program stops short. You will see an auto or sensor cycle finish after only a short run with the load still damp.
| Likely cause | What's happening | How likely | First thing to check | Fix it yourself? |
|---|---|---|---|---|
| Filmed moisture-sensor bars | softener or scale on the metal sensor bars makes the load read dry early | Most likely | wipe the sensor bars inside the drum with a little vinegar | Often DIY |
| A very small load | a few items touch the sensor bars rarely, so the reading swings to dry too soon | Possible | add a similar-fabric item, or use a timed cycle for tiny loads | Often DIY |
| Fabric-softener residue on clothes | a conductive softener film tricks the sensor into an early finish | Possible | cut back on liquid softener and clean the sensor bars | Often DIY |
| Mixed fabric weights in one load | thin items read dry while thick ones are still wet, ending the cycle early | Less likely | sort loads by fabric weight, or finish thick items on a timed cycle | Often DIY |
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Safe checks to try first#
Begin at those metal contacts, because they cause most early finishes and take a minute to sort. Find the two strips inside the drum, wipe them with a cloth dipped in a little white vinegar to strip off any softener or scale, and let them dry. Then weigh up the load: a handful of items rarely touches the strips, so the reading jumps to dry too soon, and either a fuller similar-fabric wash or a timed programme suits small amounts better. Ease back on liquid softener as well, since the coating it leaves on fabric is exactly what deceives that reading. Where you can, separate light and heavy pieces, because thin shirts drying beside towels reach dryness first and stop the run while the thick items stay wet. If the strips are spotless, the drum holds a fair load, you have cut the softener, and washing still comes out damp on an automatic setting, hand it to a technician to test the sensor and the control board rather than guess further.
When to call a technician#
Almost every cause of an early finish is yours to put right rather than a repair. Cleaning the contacts, sizing the load, cutting the softener, and separating fabric weights need nothing more than a cloth and a splash of vinegar. A technician earns the visit only when those steps fail, because a sensor that misreads even when clean, or a control board that ends the run wrongly, is an internal fault to be tested and replaced, not something to keep second-guessing at home. So clean and reload first; if a fair, softener-free wash still comes out wet with the strips spotless, that is the moment to book a visit to check the sensor and the electronics behind it.
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Common questions#
Why is my heat-pump dryer ending the auto cycle too early?#
Most often a film of softener or scale on the moisture-sensor contacts inside the drum makes them report a dry load before it is, cutting the programme short. Small loads, softener carried on the fabric, and mixed fabric weights do much the same. A quick wipe of the contacts and a fuller, sorted load usually settles it.
Could filmed moisture-sensor bars be the cause?#
Yes, and it is the leading one. The strips gauge dampness by contact, so any coating throws their reading off toward dry. Clean them with a cloth and a little white vinegar, then let them dry before the next load goes in.
Does a very small load explain it?#
It can. Only a few items seldom brush the sensing strips, so the machine decides the wash is dry far too soon. Run a fuller load of similar fabrics, or pick a timed programme for very small amounts.
Should I check fabric-softener residue on clothes first?#
Do it alongside wiping the strips. A conductive softener film riding on the fabric fools the reading just as a coated contact does. Using less liquid softener removes that trigger.
Can mixed fabric weights in one load do this?#
Yes. Thin garments reach dryness while heavy towels are still wet, so the machine calls the whole load done early. Sort by weight, or finish the heavier pieces on a timed setting.
Is this a DIY fix or a technician job?#
Nearly always one you can handle: clean the contacts, load sensibly, and go easy on softener. It only needs a technician if a clean, well-loaded, softener-free wash still finishes damp, which points to the sensor or control board.
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