L2 - R4.6 Cup Rinser Sink Overflow / Drainage Clog

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

STEP 1 - Pour hot water into the cup rinser sink to flush the drainage line. Then, verify if the drainage efficiency meet the required standard (1800ml/20sec).

• Result 1 - Drain efficiency meets the required standard.
  Issue closed. Train the customer to flush the drainage with hot water every day. 
  (Root cause: Drainage clog)
  
  
• Result 2 - Still bad drain efficiency.   
  Start STEP 2.

STEP 2 - Disassemble the internal drainage tubes and verify if the inner surfaces of the drainage tube can be thoroughly cleaned.

• Result 1 - Can be thoroughly cleaned.
  Start STEP 4.
  
  
• Result 2 - Heavy deposits.   
  Start STEP 3.

STEP 3 - Replace the drainage tubes (see internal drainage tube replacement SOP here), and follow the drain efficiency test procedure to verify if the drainage efficiency meets the required standard (1800ml/20sec)

• Result 1 - Drain efficiency meets the required standard.
  Issue closed. Train the customer to flush the drainage with hot water every day. 
  (Root cause: Drainage clog)
  
  
• Result 2 - Still bad drain efficiency.   
  Escalate to PSE.

STEP 4 - Clean the external & internal drainage tubes, and follow the drain efficiency test procedure to verify if the drainage efficiency meets the required standard (1800ml/20sec)

• Result 1 - Drain efficiency meets the required standard.
  Issue closed. Train the customer to flush the drainage with hot water every day. 
  (Root cause: Drainage clog)
  
  
• Result 2 - Still bad drain efficiency.   
  Escalate to PSE.

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