According to the problem analysis result done by TSA, you can directly begin the subsequent troubleshooting process from the corresponding potential root cause. 


 1. External water line  


2-3-1-1 - Verify all the shut-off valves on the external water line are fully turned on.


  • Result 1 - All the shut-off valves are fully turned on.
    Start 2-3-2-1.

  • Result 2 - Any of the shut-off valves is off.   
    Start 2-3-1-2.


2-3-1-2 - Turn on the shut-off valve, and verify if the water flow rate can reach 30ml/sec


  • Result 1 - The water flow rate can reach 30ml/sec.
    Issue close. (Root cause: External water line shut off)

  • Result 2 - The water flow rate cannot reach 30ml/sec.  
    Start 2-3-2-1.
  • Result 3 - The water is not dispensed at all.
    Start 2-3-3-1.





 2. Water Filter  


2-3-2-1 - Verify the flow rate before and after the water filter are the same and reach 30ml/sec.


  • Result 1 - The water flow rate before and after the water filter are the same and reach 30ml/sec.
    Start 2-3-3-1.

  • Result 2 - The water flow rate after the filter is lower than the flow rate before the filter.   
    Start 2-3-2-2.


2-3-2-2 - Replace the water filter, and verify the flow rate before and after the water filter are the same and reach 30ml/sec.


  • Result 1 - The water flow rate before and after the water filter are the same and reach 30ml/sec.
    Issue close.(Root cause: Water filter clog)



 3. Solenoid & Control Board 


2-3-3-1 - Verify the solenoid wire connection (solenoid to extension wire, extension wire to control board).

  • Result 1 - The wire connections are fine
    Start 2-3-3-3.

  • Result 2 - Any of the wire connections is inpropered.
    Start 2-3-3-2.


2-3-3-2 - Reconnect the wire properly, and verify the water dispensing function.

  • Result 1 - The water flow rate can reach 30ml/sec.
    Issue close. (Root cause: Solenoid wire disconnected.)

  • Result 2 - The water is not dispensed at all. 
    Start 2-3-3-3.

2-3-3-3 - Replace the solenoid, and verify the water dispensing function. 

  • Result 1 - The water flow rate can reach 30ml/sec.
    Issue close. (Root cause: Solenoid failure.)

  • Result 2 - The water is not dispensed at all. 
    Start 2-3-3-4.

2-3-3-4 - Replace the control board, and verify the water dispensing function. 

  • Result 1 - The water flow rate can reach 30ml/sec.
    Issue close. (Root cause: Control board failure.)

  • Result 2 - The water is not dispensed at all. 
    Escalate to FAE.