SV12 cordless vacuum dead, battery shows 3 solid blue lights | Dyson Community
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Hi folks, our own Dyson vac is behaving but my mother-in-law’s V10 / SV12 has died. No sound at all from it but the battery shows 3 blue lights when the trigger is pulled. Trigger feels normal. I’m not scared of disassembling it. 

Any suggestions as to what the fault might be, or how to diagnose it further? Cheers.