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There should be 2 valves to open if you follow the link pipe backwards.
Some of the Ecotecs have a 3 way valve and you have to be sure it is turned the correct way.
Can you upload a picture?
The two white valves will fill the heating system back up again
The loop has a built in non-return valve, this could be stuck and have to be replaced.
If you have a drain point, a hose pipe and an outside tap then it is possible to fill the system through the drain point to get it back on ubtil you can swap it out.
You fill with the 2 taps, but if they are not working then a hosepipe from your outside tap onto you drain point will fill the system until you can get it swapped out
If you speak to customer services, they will sort this got you