The manual for the DC27 can be found here (
https://www.dyson.co.uk/medialibrary/Files/Dyson/Support/downloads/UK/floorcare/Manuals/dc27_uk_manual_alf_120710%20pdf.pdf ) but is not so helpful in deep troubleshooting outside of looking for blockages.
I'm a little confused since you're talking about battery chargers, but this is posting under Dyson DC27/DC28 assemblies, which are both plug into the wall uprights. Are you possibly in the not-quite-right section? If so, reply with your model numbers and that may make things go a bit easier.
In general though, if you have dyson rechargables that both suddenly stop working, the charger is likely the issue. Look at the electrical contacts for both the batteries and the charger, and make sure they are clean (unplug cherger before touching anything, start, if possible, with compressed air to blow lint and such out). Check that the cord for the charger is not damaged, and that your wall outlet hasn't tripped a breaker or a GFI reset.
Good Luck!
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