Bosch PSR 18 LI flashing led and light

Deleted user
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Hi
I used my PSR 18 li for a polishing job. After 30 min the machine stopped, due to overheating. I let it cool down for 15 minuttes and it was on the job again.
But ever since this episode the three green LEDs and the white one is flashing when i use it now. But beside this the machine is working as usual. I have 2 batteries. Its the same for both batteries. Could the protection unit sensor be faulty ?

This post was edited by Bob Community Team on 16.02.2016, 16:03 o’clock
Reason: spell chcek

Deleted user
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hi, same problem here. I did googling for this problem, but it was not very helpful. Get in angged here for notification.
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Bosch associate
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Hi Guys.

I'm not super familiar with DIY machines but if their electronics are anything like the professional range this could well be similar to our ECP or EMP system. . All Bosch Li-ion have internal electronics to protect them from overheating which is certain death to Li-ion cells. Something internal to the tool may have been damaged and this is the tools feedback. Either deliberate or due to fault I don’t know at this stage.
 
I’ve asked a colleague in DIY to investigate for me but there is a good chance at this stage that the tool may have developed a fault.

Bob
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Bosch associate
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Hi all

I've had a confirmation back from our DIY colleagues:

It doesn't mean anything as such, other than it sounds like the tool has an interal fault. If the tool is within the warranty they can contact 03447360109 to organise getting the tool sent to be repaired or go to www.MyBosch-tools.com

Bob
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Interior designer / Decorator
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Hi, I had the same problem. Turns out that the MOSFET used to switch the voltage to the battery blows up. I did manually bypass the MOSFET to check, the motor works for a quick second and stops. Stopping is due to overheating protection since I'm using it with max current (bypass of MOSFET). I'll look for a replacement tomorrow since it's Sunday today. The component is AOD240. Images attached.
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School / College
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Hi 
I have same issue with the power mosfet. I'm wondering if the proposed solution worked. 
thank you  
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Interior designer / Decorator
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No... It didn't work. Bypassing the marked MOSFET does switch the motor in but at max power.
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Hi,

resurrecting this thread....

I have the exact same issue...applying heat to the PCB does temporarily re-enable the drill, but as the heat dissipates the drill stops functioning (battery check function still works when you pull then trigger / torch flashes and LEDs illuminate)....I have tried this several times...heat up the PCB, drill works, wait a while...drill stops working.

Has anyone been able to permanently fix this?

Thanks.