How to Fix It Not Draining on a Whirlpool WDT730PAHZ Dishwasher, Step by Step Instructions
Step by step instructions for the Whirlpool WDT730PAHZ (dishwasher, top control). Parts and access points can differ a little by production year. The steps below cover the common layout for this platform, and the model notes flag its quirks.
You can fix a dishwasher that won’t drain on a Whirlpool WDT730PAHZ yourself in 30 to 60 minutes. Difficulty is easy. A pro charges $100 to $300.
- 5 steps, 30 to 60 minutes, easy difficulty.
- Tools you need are cup and towels for bailing, screwdriver, wet/dry vac (helpful).
- Parts to buy are none for most fixes. Drain pump if the whole path checks clear.
- Unplug the machine before you start.
Standing dishwasher water can hide glass shards, bail with a cup, not bare cupped hands.
Tools
- Cup and towels for bailing
- Screwdriver
- Wet/dry vac (helpful)
Parts
- None for most fixes. Drain pump if the whole path checks clear
Step by step
-
1 Bail the standing water
Cup, towels, or wet vac the pool so you can see the tub floor.
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2 Clean the filter and sump
Twist out the filter (see the filter guide) and check the sump beneath for the usual suspects. Glass, labels, a pistachio shell perfectly sized to block the drain port.
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3 Check where the hose ends
Under the sink. Is the drain hose kinked? If it connects to a garbage disposal installed in the last year, verify the knockout plug was punched out, the #1 "new disposal" mystery.
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4 Clear the air gap if you have one
The chrome cylinder by the faucet. Pop its cap and clean out the debris. A clogged air gap backs the whole system up.
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5 Run a rinse cycle and listen
A healthy drain pump makes a steady hum with gurgling water. Silence or grinding with a clear path = the drain pump itself, cheap part, moderate access.
Whirlpool WDT730PAHZ notes & error codes
Function codes read out via a console button press sequence (check the tech sheet in the door). Most no start calls end at the control lock feature or the latch, check both before booking.
| Code | What it means |
|---|---|
| F9 E1 | Drain fault |
| F8 E4 / F6-series | Fill/float faults |
| F5 E1 | Door switch |
| F2 E2 | UI/board communication |
Full details for this machine, common problems, causes, and costs, are in the Whirlpool WDT730PAHZ repair guide. The general version of these instructions is here.
If the path is clear and the pump is silent, replacing it means tipping the machine out from the counter on most models, a fair place to hand off, and still a modest repair bill. If you'd rather skip it entirely, find a dishwasher repair pro near you
What this repair costs professionally
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