Question about Black & Decker String Trimmer Cordless 12" 18V

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CST1000 Black & Decker Cordless Trimmer/Edge won't start

We have used this cordless trimmer for 3 years with no problems. Now it is showing the green light that the battery is fully charged, but nothing happens when I press the safety switch and then the trigger.

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Re: CST1000 Black & Decker Cordless Trimmer/Edge won't...


Part number #243614-00.
It's a microswitch made by Honeywell that costs about 5 bucks plus shipping.
The attached file has the schematic and parts list.
The CST2000 is well worth spending a few bucks to keep it going. Finding a local B&D authorized service center near you will even save you the shipping as they can order it for you.
Every other component is pretty dependable- the motor, battery, wiring, charging system, spool system- all built to last.
Only down side is you really only get 20 to 25 minutes of hard weedwhacking before you need to recharge. Of course, it's time for a cold beer in the pool by then.

Posted on Apr 24, 2008

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Re: CST1000 Black & Decker Cordless Trimmer/Edge won't...

Mine had the same issue. turned out that the wiring at the cutting head was contacting the the metal of the motor. Solution: open casing around string head and tape off the exposed wire sections.

Posted on Jun 28, 2008

Re: CST1000 Black & Decker Cordless Trimmer/Edge won't...

The same thing is happening with my CST1000. ToolBarn used to have schematics for this model CST1000 but now all the CST1000's have a different design..

Posted on Aug 25, 2007

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Ryobi 40v trimmer stops working with 1/2 charge left on battery

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18v 12 cordless trimmer/edger. Why won't it start?

the trimmers switch may be faulty.

Battery packs for this tool are shipped in a low charge condition
to prevent possible problems. Therefore, you should
charge them until the green LED on the front of the charger
comes on.
NOTE: Batteries will not reach full charge the first time they
are charged. Allow several cycles (operation followed by
recharging) for them to become fully charged.
See Figure 3.
If battery pack is within normal temperature range, the red
LED on charger will come on.
NOTE: If the charger does not charge the battery pack
under normal circumstances, return both the battery pack and
charger to your nearest Ryobi Authorized Service Center for
electrical check.
n Charge the battery pack only with the charger provided.
n Make sure the power supply is normal household
voltage, 120 volts, 60 Hz, AC only.
n Connect the charger to the power supply.
n Place the battery pack in the charger aligning raised rib
on the battery pack with the groove in the charger.
n Press down on the battery pack to be sure contacts on
the battery pack engage properly with contacts in the
n Normally the red LED on charger will come on. This
indicates the charger is in fast charging mode.
n Red LED should remain on for approximately 1 hour
then the green LED will come on. Green LED on
indicates battery pack is fully charged and charger is
in maintenance charge mode.
NOTE: The green LED will remain on until the
battery pack is removed from the charger or charger is
disconnected from the power supply.
n If both yellow and green LEDs come on, this indicates
a deeply discharged or defective battery pack.
Allow the battery pack to remain in the charger for 15
to 30 minutes. When the battery pack reaches normal
voltage range, the red LED should come on. If the
red LED does not come on after 30 minutes, this may
indicate a defective battery pack and should be
n After normal usage, a minimum of 1 hour of charging time
is required to fully recharge battery pack.
n The battery pack will become slightly warm to the
touch while charging. This is normal and does not
indicate a problem.
n Do not place the charger and battery pack in an area of
extreme heat or cold. They will work best at normal room
NOTE: The charger and battery pack should be placed
in a location where the temperature is more than 50°F
but less than 100°F.
n When batteries become fully charged, unplug the
charger from power supply and remove the battery

Jan 23, 2016 | Ryobi Lawn Trimmers & Edgers

1 Answer


Sorry, but I haven't solved any problem. I'm still waiting on the experts to solve my problem from June 16 on my trimmer not operating even with new fully charged battery. As for your replacement, I would suggest retail stores that sell trimmers, such as Home Depot, Lowes, Ace hardware stores or maybe B&D website.

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1 Answer

My trimmer wont start. thought it was battery put a new one in worked for a few minutes and then stopped working

your batteries aren't charging fully, check them fully charged with a volt meter,, fully charged they should have a reading of 18.5 volts, if not they are not charging, and either the batteries have used up their life, or your charger is on its way out

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Bought unit last year...when charging battery for 1st time this year red goes to green fairly quickly but only lasts a few minutes when using trimmer

sounds as though the battery needs replaced, can check and see if it has a warranty on the battery. Hope this helps Tim

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The battery on my Worx GT doesn't seem to hold it's charge. I have actually taken it directly off the charger when the light is green and it doesn't have full power. Sometimes it does. The unit is 3...

the first time the Worx GT worked great since then I took it off the charger and it won't go more than five min. without going dead. I'm back using my gas trimmer what's up ith th battery on the Worx Gt

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Will not come on

yes it will have to be the main motor will be siezed full of dirt and dust they clog up you can try to unclog it also

Jul 28, 2008 | Black & Decker String Trimmer Cordless 12"...

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