wrote in message
oups.com...
I seriously doubt any machine malfunction can make the machine drain
too fast. The trouble is the sewer line is undersized or clogged...

I agree with you. Plus the newer washers use a low pressure/high capacity
pump rather than the old high pressure/low capacity pumps. A lot of older
houses won't handle the new washers unless the pipes are increased in size.
Of course there is the possibility that lint from the old washer has
hardened and clogged the trap for the washer as the OP said that he travels
a lot and doesn't use the washer every day. The trap could be drying out in
the 4 wks or so he is on the road and leaving the lint accumulating.
Tom G.