What does the NON HE soap do to the front loaders?
It does several things. HE detergent is low to no sudsing. The suds are what kills front load and all HE washers. First, your standard detergent is set up for the top load washers. Top load washers use aprox. 64 gallons of water on large load setting. HE washers typically use between 8 and 15 gallons. More water diluting the soap. Salesmen and women say "You can use regular detergent but cut it in half. " NOPE you lose the washability at that point. The HE detergent is made up of different enzymes that break down dirt and those are less sudsing.
Service calls I run on the HE washers
"I keep getting error codes on the display"
The suds dont silter through the basket,the CPU is sensing the weight, the pump is trying to drain (it thinks there is water in there) and it puts up a LD (long drain) error code. Also, the suds have a tendency to eat up the pump motor assy after a long period of time. Another error is SUDS. The unit actually locks the door,flashes SUDS, and you have to call for service to get unit out of suds lock. (there is a procedure) Suds have a tendency to bubble over, want to guess where the high dollar electronics are? Yup, on the bottom. Water / suds dont mix well. Also, as stated, the suds dont filter through the basket. When pump turns off the suds remain. The suds dissipate, turn back into water,and now the clothes are too wet to put into the dryer.
Please note that these are mostly "short term" problems. We are starting to see "long term" problems of prolonged use of non HE detergent like rear bearings on the basket, false error codes on the main CPU.
Sorry for this being so long, but typically, even if its only a few weeks old, the manufacturers dont cover "oversudsing" under warranty or extended contract as it is "customer instruct" and not a defect in the appliance.
P. S. As of today, I am unaware of a hypoallergenic HE detergent. Yes there is dye / perfume free. Same with Dreft. (detergent for infants) If you have these issues there is no HE detergent and might want to consider buying HE units. That said, I own the Whirlpool Duet. They are PHENOMINAL!