Bosch Tool Overload Protection — Cause & Reset

What Does This Error Mean?

Bosch cordless tools cut power when they detect motor overload — too much current draw for too long.
You'll typically feel the tool stop suddenly and the battery indicator may flash.
Release the trigger, wait 5–10 seconds, and squeeze again.
The tool resumes normally.
Frequent overload trips mean you're pushing the tool past its rated work — slow down or switch to a more capable tool.

Affected Models

Bosch 18V GSR Drill
Bosch GBH Rotary Hammer
Bosch GKS Circular Saw
Bosch GST Jigsaw
Bosch Professional 18V

Common Causes

Pushing too hard on the tool — feeding faster than the cutter can clear
Dull blade or bit increasing the load
Cutting material harder than the tool is rated for
Battery near empty — voltage sag triggers overload protection
Internal tool fault (rare — usually after years of heavy use)

How to Fix It

Release the trigger immediately.

Don't keep squeezing.
The tool's protection has cut power; squeezing harder won't help.
Let go, take a breath, and reset your stance for the next attempt.
Wait 5–10 seconds.

The protection circuit needs a few seconds to reset.
Pulling the trigger immediately won't get a response.
Wait, then try again with a lighter touch.
Check the cutter or bit.

A dull bit or worn cutting edge is the most common cause of repeat overloads.
Drilling into hardwood with a worn-out bit takes much more current than with a sharp one.
Replace cutting edges before they're noticeably dull — it's cheaper than replacing tools.
Reduce feed rate.

Let the tool cut at its own pace.
Pushing harder doesn't make it cut faster — it just loads the motor.
If you're feeding correctly, the tool should sing in a steady tone, not bog down.
Check battery charge.

A battery near empty supplies less voltage, which the tool reads as higher current draw — overload protection trips earlier.
Swap to a fresh battery and see if the trips stop.
If they do, the previous battery was just running low.

Frequently Asked Questions

Will overload protection damage the tool over time?

No — that's why it's there.
The protection circuit catches overload before the motor windings overheat.
Frequent trips do mean you're working the tool harder than designed though, and constant heavy use shortens overall lifespan.

How is Bosch overload different from a thermal cutout?

Overload = current spike, immediate cut.
Thermal cutout = temperature build-up over time.
Overload trips and recovers in seconds; thermal needs a few minutes to cool.
Both are different protection circuits in the same tool.