Bosch Dryer Timer Won't Advance: Causes & Fix

Why won't my Bosch dryer's timer advance?#

Why a Bosch timer moves the way it does#

Unlike an old fixed-time dryer, Bosch AutoDry measures moisture continuously and shows an estimate that updates as the load dries. If clothes dry faster than expected the time drops in jumps; if a heavy load is slow, the number can sit still or even climb. That's by design, not a fault. It only counts as a problem when the exact same number holds for 30 minutes or more, which means the cycle is stuck in a loop.

The most common causes, ranked#

Dirty sensors (start here): the two metal sensor bars sit just inside the drum on the front bulkhead, and a film of fabric softener or detergent residue makes them read moisture that isn't there. Wipe them with white vinegar and buff lightly with 400-grit sandpaper until the metal is bright again.

The board: if the sensors are clean and the number still won't move across cycles, the board's cycle-management circuit is stuck. A 60-second unplug clears a transient glitch; a fault that returns every cycle means the board needs replacing.

The load: drying towels and bath mats together with t-shirts and underwear confuses AutoDry — the thin items dry while the thick ones stay damp, and the sensors flip between wet and dry. Sort by fabric weight and dry heavy items on their own.

Check it yourself#

1. Decide whether it's truly stuck (same number 30-plus minutes) or just slow, which is normal for dense loads.
2. Clean both moisture-sensor bars with vinegar and 400-grit sandpaper.
3. Run a Timed Dry cycle — if that finishes normally, the problem is sensor-related, not the motor or heat.
4. If the number is genuinely frozen, unplug for 60 seconds to reset the board.
5. Re-sort the load by fabric weight and try again.

Repair or replace?#

Almost every stalled-timer complaint is a free sensor cleaning or a load-sorting habit, so this is nearly always worth fixing — especially under 8 to 10 years old. Only a genuine control-board fault is a pricier call, and a diagnostic visit confirms that before any part is ordered.

Frequently asked questions#

My Bosch dryer's timer jumps up mid-cycle — is it broken?#

No — that's AutoDry recalculating from the moisture readings. If the load is wetter than it first estimated, the number adjusts upward, which is normal. Only if it never counts down at all, or holds the same value for over half an hour, should you clean the moisture sensors.

How do I clean the moisture sensors on a Bosch dryer?#

Find the two metal bars just inside the drum on the front bulkhead and wipe them with white vinegar, then buff lightly with 400-grit sandpaper until they're bright. A residue film from detergent or softener is what makes them misread, so this restores accurate dryness detection.

Is a slowly counting Bosch timer a problem?#

Not usually — a dense or heavy load legitimately drops the estimate slowly, sometimes only a minute at a time. It's a problem only when the exact same number holds for 30 minutes or more, which points to dirty sensors or a stuck board.