Why doesn't CarbonDoser 2.0 push CO2 out?

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dochou

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It was working normally for about 6 months.
It then stopped pushing bubbles into the Calcium reactor.
I disconnected the tubing that runs from the white CarbonDoser box and checked to see if CO2 came out, and there was none.
I adjusted the white box knob/dial to max bubbles, ie bubble count less than .05 seconds (knob/dial all the way counter clockwise). The red light on the white box blinks as the dial indicates.
I checked the tubing running from CO2 Regulator to the white box, and there was CO2 flowing from the regulator.
I reconnected all tubing and then turned the knob to fully open on the regulator with max bubble count on the white box, but still no bubbles going into the reactor. I double checked it by disconnecting the tubing going to the reactor again. And there was no CO2 flowing out.
My conclusion is that there is something wrong inside the white box. CO2 goes in but doesn't come out.
Is the solenoid bad? Is there a clog?
How do I fix this? :thinking-face:

Any advice would be greatly appreciated.
Aqauriumplants.com seems to be out of business, so no customer support.
Thanks!:beaming-face-with-smiling-eyes:
 
Have you tried taking apart the white box or is that not possible?
 

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