Instruct: Classify Amazon reviews into positive or negative sentiment
Query: more trouble than it's worth

I had this device installed by my plumber after my previous washing machine overflowed and destroyed the ceiling below. It worked fine for about a year, but has been nothing but trouble since. I have had numerous service calls on my washing machine because of water flow problems (no hot water this time). It is impossible to bypass this unit to troubleshoot any washing machine problems. It's really frustrating. The washing machine repairman always blame this unit. In the latest case, he was correct. This unit is not allowing any hot water to flow to the washing machine. The electronic aspect with no manual shutoff removes any control on the part of the user. It also cycles on and off and causes huge house-shaking knocking sounds when the washing machine is on the hand-wash setting. I cannot have this un-installed fast enough!