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What does PU error mean? on a Simpson Oncore 556?

can I fix it myself?
Dave, June 2012
Drain pump error. Means water is not draining or is draining too slow. Check for blockage or listen if pump is even trying to move. There will be a slight humming noise if it is trying but stuck.

Lincoln Appliance NZ, June 2012
link Click here to see other fixes for Simpson.