The short answer
On the T models a cycle fault means the machine is not getting the feedback it wants. The table below carries two model codes for this family, close enough in build that the layout described here holds across both.
What you observe on these models
- The cycle ends after a few minutes with the load still wet — Sensor drying decided the load was dry. A filmed sensor or a very small load both do this, and neither is a failure.
- The cycle runs and runs and never completes — The opposite fault: the machine cannot reach the dryness it is looking for because air is restricted or heat is missing.
- The machine stops mid-cycle and shows a warning — On a condenser model the condensate tank being full stops the cycle by design.
- Clothes come out hot on the outside and damp inside — Air is moving too slowly to carry moisture away — a blocked filter, a blocked condenser unit, or a restricted vent.
- The drum turns but nothing gets warm — That is a heating fault rather than a cycle fault, and it has its own page for this family.
- Timed cycles work but automatic cycles do not — A clean split: the heating and the drum are fine and the moisture sensing is not.
Causes, most likely first on the T family
- The lint filter or the condenser unit is blocked — First. Clean the lint filter every load and check the condenser unit behind the lower panel if your model has one — a blocked one ends cycles early and lengthens the rest.
- The condensate tank is full — Second, and unmistakable once you know to look: the machine halts with a warning and resumes as soon as the tank is emptied.
- The moisture sensor bars are filmed over — Third, and the classic cause of "it stops after five minutes". Wipe the bars with a little rubbing alcohol on a cloth.
- The load is too small or badly sorted — Common and free to test: add a couple of dry towels to a tiny load and see whether the cycle behaves.
- A sensor circuit or the control has failed — Last, and worth reaching only by elimination — everything above it is free and far more likely.
Check in this order, and why
- Clean the lint filter and check it passes water — Hold it under a running tap. If water sits on the mesh rather than passing, the filter is coated with softener residue and air is not getting through either.
- Empty the condensate tank and check the condenser unit — On a condenser model the tank stops the cycle when full, and the condenser behind the lower panel needs rinsing periodically.
- Wipe the moisture sensor bars — They are the two metal strips inside the drum opening. A cloth with a little rubbing alcohol removes the film that makes a wet load read as dry.
- Run a normal-sized load on a timed cycle — If a timed cycle dries properly and an automatic one does not, the heating and the drum are fine and the fault is in the sensing.
- Stop at the control — Clear air, an empty tank, clean bars and a failing automatic cycle leave the sensor circuit or the control, and those are behind panels on these models.
Models in the T family — Each code here is pinned to a single build, so match the tag inside your door frame character for character.
Reference| Model number | Family key |
|---|---|
| T21 | bosch:dryer:t |
| T27 | bosch:dryer:t |
Before you open anything
Safety
Unplug the dryer or switch off its breaker before any panel comes off — a capacitor can hold a charge after the power is off. Lint is fuel: a restricted vent is the leading cause of dryer fires, so treat weak airflow as urgent rather than annoying.
When to call a technician
Call when the air path is clear, the tank is empty, the bars are clean, the load is normal, and the automatic cycle still misbehaves. That leaves the sensing circuit and the control, and both are behind panels on these models.
Sources — The symptom-report corpus recorded in this snapshot is what put this symptom on the page for this brand and appliance.
Documented- rollup — rollup, fetched 2026-09-02
Other symptoms covered for this family
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
