Bosch PS21 Troubleshooting

Bosch Handheld Cordless Drill - Model Bosch PS21-2A 12.0 Volt Max 2.0 Ah 2-Speed Complete Kit with 2 Lithiom-Ion Batteries, Vertical Stand Charger and Zip Case

Trigger doesn’t work ¶ 

When you press the trigger the drill doesn't work.

Battery is not charged ¶ 

The Bosch PS21 Cordless drill comes with 2 12.0 Volt 2.0 Ah battery packs. If one battery pack is not charged, try the other. Try charging one of the batteries in the included charging base for 1 hour. If the drill is still not working properly, recharge the other battery for 1 hour and try it out.

Battery is faulty ¶ 

If the batteries are not charging, they may be faulty. Lithium-Ion batteries are very powerful and contain hazardous chemicals. If the batteries are faulty, they must be replaced. Replace the battery using this guide.

Trigger is faulty ¶ 

If the trigger is not working after the previous steps, the trigger must be faulty and might need to be replaced. Replace the trigger using this guide.

Clutch won’t work ¶ 

The adjustable clutch doesn't rotate or is stuck.

Clutch is faulty ¶ 

If the clutch is not working, the gearbox will need to be replaced. Replace the gearbox using this guide.

Batteries are not charging ¶ 

The batteries will not charge.

Batteries are faulty ¶ 

If the batteries are not charging, they may be faulty. Lithium-Ion batteries are very powerful and contain hazardous chemicals. If the batteries are faulty, they must be replaced. Replace the battery using this guide.

Charger is faulty ¶ 

If the battery is replaced and the drill is still not working, the charger must not be working. If the charger is faulty, it must be replaced.

Drill bit is not spinning ¶ 

The drill bit is not spinning fast enough or is not spinning at all.

Battery is not charged ¶ 

The Bosch PS21 Cordless drill comes with 2 12.0 Volt 2.0 Ah battery packs. If one battery pack is not charged, try the other. Try charging one of the batteries in the included charging base for 1 hour. If the drill is still not working properly, recharge the other battery for 1 hour and try it out.

Battery is faulty ¶ 

If the batteries are not charging, they may be faulty. Lithium-Ion batteries are very powerful and contain hazardous chemicals. If the batteries are faulty, they must be replaced. Replace the battery using this guide.

Motor is faulty ¶ 

If the motor is not working after the previous steps, the motor must be faulty and might need to be replaced. Replace the motor using this guide.

2 Comments

left my bosch 18 v impact driver out side and it did rain and got wet . i accidentally pressed trigger and turn it on it did worked shortly and then stop and now completely dead.. what kind of damaged i created ? fixable ? any parts should i replace to fix it?

pls help .. thanks kid

rey panelo - Reply

i got the ps21 out of the bins at the goodwill outlet, along with the charger. no battery. i cleaned it up , looked pretty good so i sold it on ebay . fetched a pretty good profit …well without a battery and no test i shouldve kept it ….it didnt work…so the dude sent it back …i found this site …took it apart …cleaned it put it back together twice . installed new battery and works like a brand new one … im sure ill keep it now …handy little devil!!

Kevin Mulkins - Reply

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