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Getting tired of finding dishwashers with the drain hose looped wrong
I opened up a Bosch yesterday and someone had the drain hose running straight down into the disposal instead of making a high loop. Water just siphons right back into the unit and rots. How do you guys handle customers who swear their handyman knew what he was doing?
4 comments
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lopez.quinn9h agoMost Upvoted
Are you really so sure gravity is a better bet than a properly seated check valve? I've seen plenty of those zip-tie loops get knocked loose when someone shoves a pot or a baking sheet into the cabinet, and then you're right back to siphoning. And on a lot of the newer machines I've worked on, the check valve is actually inside the pump housing and works fine without a high loop at all, as long as the drain line isn't kinked or crushed under the unit. If the manual says the high loop is just a backup, and the check valve is working, then that handyman might not be as wrong as you think, especially if the hose is short and can't be looped easily under the sink.
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the_amy9h ago
Are you sure those check valves are actually reliable? I've had three different brands where the valve stuck open and the unit still backflowed without a high loop. If your only backup is a plastic flapper that costs 2 cents to make, I'm not trusting it over something as simple as gravity.
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the_faith12h ago
Remember most dishwashers have a check valve built into the drain pump now, so the high loop is more of a backup than a necessity on newer machines. Point your customer to the manual that came with the unit, it usually spells it out in simple diagrams that are hard to argue with. If the handyman skipped the loop and the drain line is long enough, you can sometimes just zip-tie a loop up under the counter without even pulling the unit out.
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Last Bosch I did like that the guy swore his cousin plumbed it perfect. I just pulled the manual up on my phone real quick and showed him the diagram with the high loop, plus pointed out the part where it says improper draining voids the warranty. He shut up pretty quick after that. For the ones that still argue, I offer to zip tie the loop up under the counter right there for an extra 20 bucks, most of them take it once they see its just a quick fix.
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