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Lew is correct in that a proper pressure must be set.
You can find parts kit here - http://www.google.com/products/catalog?q=goodman+LPM-05&rls=com.microsoft:en-us:IE-SearchBox&oe=&um=1&ie=UTF-8&cid=15858252722657501067&sa=X&ei=NqqUTae5IcO30QGwy4DlCw&ved=0CCQQ8wIwAg#
But the installation must be accurate. If satisfied please click accept on Lew.