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HomeRepair HelpThermador Dishwasher RepairThermador Dishwasher not draining Repair
Thermador Dishwasher not draining
If your Thermador dishwasher is not draining and you are left with standing water in the tub, start with the most common cause: clogged sump filters. A blocked coarse filter or fine filter in the sump assembly can restrict water flow and lead to a dishwasher clogged drain. If the filters are clear, the next likely problem is the drain pump. A failed pump motor or damaged impeller can keep the dishwasher water not draining through the drain hose. After that, check the control board, since a faulty board may not send power to the drain pump. Less often, the drain impeller, drain solenoid kit, or drain valve is the reason a Thermador dishwasher is not draining. Debris in the drain valve can also stop water from leaving the machine. If your dishwasher standing water problem keeps coming back, inspecting these parts in order is the fastest way to narrow it down. Enter your model number on RepairClinic.com to find the exact Thermador drain pump, filter, control board, drain impeller, drain solenoid kit, or drain valve that fits your specific dishwasher.
01 - Clogged Sump Filters
The sump assembly, located at the bottom of the dishwasher tub, contains the pump motor or motors to both circulate and drain the water. There are usually two filters in this assembly to strain food particles: a course filter and a fine filter. If the filters are clogged, the unit will get low water flow and poor washability. To clean filters, remove them from the sump and wash them with soap, warm water, and brush. If the filters are damaged, they should be replaced.
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02 - Thermador Dishwasher Drain Pump
The drain pump uses an impeller to force water through the drain hose. If the drain pump motor is not working, the dishwasher won’t drain. To determine if the drain pump is defective, check the pump motor for continuity using a multimeter. If the motor does not have continuity, or if is getting power but won’t run, replace the drain pump. Drain pumps are not repairable—if the drain pump is defective, you must replace it.
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03 - Thermador Dishwasher Control Board
A dishwasher's control board provides power to nearly every electrical component in the dishwasher. A faulty board may be unable to supply power to the drain pump, preventing it from drawing the water out of the tank and forcing it through the drain hose to the garbage disposal or sink drain pipe.
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04 - Thermador Dishwasher Drain Impeller
The drain impeller pushes water through the drain hose and into the garbage disposer or drain line. If the impeller is broken, replace it.
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05 - Thermador Dishwasher Drain Solenoid Kit
The drain solenoid opens the drain valve to allow the water to exit the dishwasher. If the drain solenoid fails the valve will not open causing the dishwasher not to drain.
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06 - Thermador Dishwasher Drain Valve
Over time, the drain valve can get clogged with debris. To ensure that water can flow through the drain valve, clean out the valve. If the drain valve is clear of debris but it still won’t actuate, replace it. Drain valves are not repairable—if the drain valve is defective, you must replace it.
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Frequently Asked Questions
Why is my Thermador dishwasher not draining and leaving standing water in the bottom?
How do I tell if the drain pump is bad on my Thermador dishwasher?
Can a clogged drain valve or bad drain solenoid keep a Thermador dishwasher from draining?
Should I replace the control board if my Thermador dishwasher water is not draining?
How do I find the right Thermador dishwasher drain pump or drain valve for my model?
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