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When the heater is block by a lack of water pressure you should do this to put back the heater on functioning:

1. Read the pressure, it should be below 0.8 bar so it can be considered an error
2. Find the valve to fill pressure or water, it is the blue one indicated in the video.
3. Open the valve to the left, you will hear a sound of water coming in and the indicator of pressure will rise.
4. When the pressure reach 1 or 1.5 bar you should close the valve to the right position.
5. It is pretty important to close it well, because if not is going to leak water by the safety valve.

This error is associated with no hot water or heating system in the boiler you loss both services. Also a red light and sign appear on the boiler indicating low pressure. It appear as 21 number

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