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Customer Questions and Answers for Syphon Breaker (Dishwasher Drain Air-Break) by Whirlpool

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Manufacturer Part
4.89 (64)
By: Whirlpool
Part Number: OEM9220740
Manufacturer Part Number: 285320

This syphon breaker prevents dirty drain water from being siphoned back into the dishwasher, helping maintain proper draining and protect wash water from contamination. It's a direct-replacement drain air-break for compatible dishwashers. What it does:

  • Stops backflow/siphoning from the household drain into the dishwasher
  • Helps maintain proper drain performance and prevents wastewater re-entry
  • Can reduce odors and cloudy or soiled dishes caused by contaminated wash water
  • Works as part of the dishwasher's drain plumbing to preserve wash hygiene
What's included: One syphon breaker Install notes:
  • Disconnect power to the appliance and turn off water supply before servicing
  • Replace only with identical part and ensure correct hose routing and secure clamps
  • Inspect adjacent drain hoses and connections; replace damaged hoses or clamps as needed

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Questions & Answers

For Whirlpool Syphon Breaker (Dishwasher Drain Air-Break) (Part Number: OEM9220740)

1 Answer

Jim, The most common reason for the dispenser cup to fill with water then it would cause the unit to have water pressure being too high causing it to flow too much into the fabric softener cup.

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1 Answer

Tom, The drain would not have a solenoid on it and if there is power constantly to the pump then this will be a control board issue. If there is not power then this will most likely be a siphoning issue and the standpipe needs to be at least 39" off the floor.

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1 Answer

Dave, This issue will most likely not be caused by a faulty capacitor. For this issue it would be more likely that the contacts in the timer are stuck and causing a crossed signal to the motor. This would require a new timer.

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Dan for Model Number LSR5132JQ1

Trying to figure out what to try first, here is a description of the problem: The washer will intermittently not stop filling with water, resulting in an overflow. the agitator does not start, so it seems as though the washer is not receiving the signal indicating it's full. I'm not sure if this is done off of a switch or a timer. advancing the cycle results in the washer agitating, and then draining, and the refilling for the rinse. sometimes the washer will get stuck filling again, but usually operates as normal. seems to happen most frequently with hot water loads.

1 Answer

Hello Dan. If you can stop the water from entering the machine by turning off the timer or unplugging the unit, you will need to look for a bad pressure hose or replace the pressure switch. If the only way to shut off the water is at the shut off for the water hoses, you will need to replace the water valve in the unit.

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1 Answer

Hello Mike. You will need to check the water valve and the pressure switch on the unit.

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1 Answer

Hello John. Check for clogs in the drain pump and hoses. If none is found, and all is clear, you may need to replace the drain pump on the unit.

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1 Answer

Hello Jarom. Make sure the drain hose is not to far into the pipe and that the drain hose is not air tight. Also, needs a loop higher then the bottom of the tub assembly.

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