Holden astra convertible roof wont open. beeps 6 times when the open button is pressed

Lots of problems with those roofs. Take it back to the place that fixed it and tell them to fix it properly. Probably air in the hydraulics.

https://www.google.com/search?q=Opel+Astra+Bertone.+Message+%27too+slow%27+appears+when+trying+to+open+roof

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Is this for the runner rails for the sunroof? You need to use standard grease not oil. Oil is too thin for the job.
Make sure you get the runners as clean as you can before you add the new grease.
Don't add too much grease as it will squeeze out as the roof slides. For Each runner add a lump of grease about three or four times the size of a large pea. Apply the grease to the full length of each runner making sure you get some under the moving end of the glass runners. Then fully open and close the roof 3 or 4 times to load the rollers on the roof panel itself.

possible problems---module switch failure --wiring circuit failure -window track problem [cocked off track debris track damage ]-

Is it hydraulic might have air in the system

try this web page

2002 Holden Astra Hatch 1 8 Repair Service Manuals

it could be a weak spring. or somthing in the way do you hear a clunk when you rise or lower it ?

You need to pump the hydraulics manually, to do this first sit on boot and press boot button for a few seconds without allowing the boot to open. Partially allow boot to open, manually push boot all the way open and closed a dozen or so times to manually pump hydraulics. I had same prob, this sounds extreme but does work and wont cost you a penny.

my 1999 saab 93 converible roof will only open if i press the button twice why is this

the astra convertable is prone 4 this problem take it to vauxhall there is a rework and it wont cost u a penny!!