Upon arrival found unit primary safety switch to be engaged and several gallons of water in drain opening and under patio as customer showed me . The existing drain line is 3/4 pex line while the inside is 3/4 pvc. To solve this issue I installed an adapter to connect the pex and pvc together. Afterwards I cleared and tested the drainline which is draining properly as well as removed as much water as possible. Thank you for your business.