Maybe you timer spoiled. did you unplug the cable and see if the CO2 cut off? if not cut off then your solenoid stuck.
Just bought this last June. All was fine till this morning when I realised that the co2 was not cut off when the timer was supposed to be off from 10pm. My fauna are like grasping at the surface with one overturned. I took out the power head from the timer and the co2 was still dispensing.
Can I confirm that the solenoid was spoilt? It was bought shorter than a year. Such disappointment. Any remedy?

Maybe you timer spoiled. did you unplug the cable and see if the CO2 cut off? if not cut off then your solenoid stuck.
I believe the solenoid is stuck because I unplug the cable and it is still dispensing co2

Normally it will not stop immediately. but if you still able to see bubble in bubble counter after a while then most likely solenoid stuck.
Solenoid confirmed stuck. I went to buy OF solenoid from NA after work just now.
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