When my washing machine is set to wash a load on hot, the cold water pipe rattles. The pipe is firmly anchored to the wall. The pipe makes a noise like a hose that is half-kinked, like theres an air bubble in it. The noise is coming from the pipe on the wall and not the washing machine itself.
How can I diagnose this problem? Why would a washing machine set to hot use any cold water at all? What would cause my cold water pipe to make this noise?