Test dishwasher high loop
Why it matters
Code-required to prevent backflow contamination; ensures dirty water doesn't enter dishwasher.
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How to do it
- 1
Run dishwasher cycle through drain phase.
- 2
Watch and listen under sink for backup.
- 3
Inspect drain hose for kinks.
- 4
Straighten and secure with clip if kinked.
- 5
If air gap cap exists, unscrew and clean.
- 6
Run another cycle to verify no backup.