The short answer
On the BLH family a cycle that misbehaves is nearly always a measurement problem: the machine is drying, but what it senses about the load or the airflow is wrong. That reorders the brand-generic page, which opens at the control board.
What you observe
- Clothes hot on the outside and damp inside — Restricted airflow: the machine is making heat it cannot carry away.
- Cycle ends after a few minutes with wet clothes — The control believes the load is dry, which points at the moisture sensor or at a very small load.
- The display counts down then adds time back — The control is retrying a step it cannot complete, usually because it cannot reach its target.
- Only heavy loads misbehave — Marginal airflow: a small load still dries, a heavy one never reaches the sensor threshold.
- NEAR MISS - no heat at all in any cycle — That is a heating fault and belongs on the heating page.
Causes, most likely first on BLH
- Moisture sensor bars dirty or coated — Ranked first on the BLH family: softener residue builds an insulating film on the sensor bars, and a filmed sensor calls a wet load dry within minutes of the start. What decides the order here is the protection chain, and on this family that chain is common to every model listed. This moves above restricted vent or a blocked lint path, which leads the brand-generic order, because this family is a single build with fixed access points.
- Restricted vent or a blocked lint path — Second: the machine judges the load by how fast moisture leaves it, so a duct that has closed down stretches every automatic cycle before it fails one outright.
- Thermistor or cycling thermostat drift — Third: cycle length is set from temperature as well as moisture, so a sensor reading a few degrees off stretches or truncates the run with nothing else to show.
- Load size and load sorting — Fourth: a very small or very mixed load simply never touches the sensor often enough, and that is a loading problem rather than a fault.
- Control board or timer failure — Last: last, because the duct and the sensor between them explain nearly every cycle complaint that reaches a technician on this family.
Check in this order, and why
- Run a timed cycle and see whether it dries — This single test splits sensing faults from heating and airflow faults.
- Compare the discharge at the outside vent with what it used to be — It isolates the duct without the machine ever having to run unducted.
- Dry one small mixed load and compare with a heavy one — A machine that manages small loads only is telling you airflow is marginal.
- Repeat with a normal mixed load — Do this last, because a very small load can fail a sensing cycle on a perfectly healthy machine.
Before you open anything
Safety
Kill the power before opening anything, and run the machine only with its panels fitted and its duct connected to the outside. The drum, the blower and the heater all move or get hot.
When to call a technician
Unplug the appliance or switch off its breaker before removing any panel. A capacitor can hold a charge after the power is off. Filter, sensor bars and the vent run are owner work. Call when timed cycles dry normally and automatic ones still will not, because the sensing circuit is then inside the machine.
Other BLH pages
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
