Determining whether your washing machine drain pipe or wall standpipe is clogged involves observing how wastewater behaves during a drain cycle. Key signs of a clogged drain pipe include water backing up and overflowing out of the standpipe onto the laundry room floor during high-volume drainage, the washing machine flashing drainage error codes like "OE" because it cannot expel wastewater fast enough, or hearing gurgling bubbling sounds from nearby sinks. You can troubleshoot drainage clogs easily by observing water flow. You can verify that your corrective action is successful when clearing lint and debris out of the standpipe with a plumbing snake or resetting the drain hose height allows wastewater to empty rapidly down the pipe without overflowing.
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