The short answer
A cycle that stops early or refuses to finish on the WTH family is usually the machine acting on information, not failing. On the two models below the control decides when to stop from what its sensors report, so a cycle that ends with a wet load generally means a sensor was told the load was dry, and a cycle that stalls generally means a condition the machine is waiting on has not cleared.
What you observe on these models
- The cycle restarts or seems to go backwards — Estimated time being recalculated, which looks like the machine losing progress.
- It stops and beeps with an unfamiliar symbol showing — Note exactly what is showing before clearing it; it is the best evidence you will get.
- Everything works after a filter clean, then returns in a fortnight — A restriction that is rebuilding faster than it should, which is itself the finding.
- Softener sheets are used on most loads — Residue on a moisture sensor is a well known cause of cycles ending early.
- NEAR MISS - loud noise as well as a stopped cycle — A mechanical fault that stops the machine belongs with the noise symptoms.
Causes, most likely first on the WTH family
- Something the machine is waiting for — First on the WTH family, because it is the cause that produces the most dramatic symptom for the least reason. Reservoirs fill, prompts appear, doors are closed without latching, and the cycle simply holds. Check it before assuming anything has failed.
- Sensing that is reading the load wrong — Second. It gives the early finish with a wet load, and it is confirmed free of charge by running the same load on a timed programme.
- Airflow — Third in rank but always worth doing, because a restriction is what turns a marginal sensing fault into an obvious one, and because it is the maintenance the machine actually needs.
- Thermal protection, control or wiring — Last. On the two models below a cycle that stops dead and will not restart after everything above is clean points here, and that is a service call.
Check in this order, and why
- First: reproduce it deliberately with a known load — A medium load of similar fabrics, on the programme that fails. Guessing from mixed loads makes every later test unreadable.
- Second: work the free causes in order — Reservoir, prompts, door properly latched, filters clean, sensor wiped. All of them before anything is measured.
- Third: change one thing and repeat — Either the programme or the load size, not both. On the two models below this is what turns a vague complaint into a repeatable fault.
- Fourth: stop when the panel comes off — Anything that survives all of the above sits in wiring, sensing or the control, and none of those are diagnosed with the machine assembled.
Before you open anything
Safety
Isolate the machine at the breaker before any panel comes off; a capacitor can hold a charge after the power is off. Never run the two models below with a filter removed to see whether airflow improves: the lint that the filter was catching then goes where it cannot be cleaned out, and that is the condition that makes a heating fault into a fire risk.
Models in the WTH family
Reference| Model number | Family key |
|---|---|
| WTH83002AU | bosch:dryer:wth |
| WTH8300AU | bosch:dryer:wth |
When to call a technician
Call when the cycle still fails after the filters are clear, the reservoir is empty, the sensor is clean and a timed programme has been tried. At that point the fault is in sensing, wiring or the control, and on the WTH family none of those are reachable without opening the machine. Call sooner if the machine stops dead mid-cycle and will not restart, which is a different and more urgent pattern.
Sources — The symptom-report corpus recorded against Bosch WTH dryer pages for this fault is cited below. No share is quoted from it anywhere on this page: the snapshot reaches this page as a provenance chain without values, so every ordering here is technician judgement rather than a measured proportion.
Documented- amazon-reviews — amazon-reviews, fetched 2026-09-02
Other faults covered for the WTH family
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
