There are a number of indications that show the carbonator is empty:
- When you press the carbonating button and don't see any gas going into the bottle of water.
- Even after repeated presses you don't reach the 'buzzing' sound
- The carbonating button may stay down
- The carbonator splutters, indicating it has run out of CO2
If you need a new or spare cylinder, please visit https://www.sodastreamusa.com/60L-Sp...ngle-P265.aspx to order directly or find a retailer in your area.