MACDS650
New Member
I purchased this unit in 2021 installed in Dec. I started noticing hot water would go cold all of a sudden, intermittently, finally it completely stop pushing hot water. I opened and removed the front cover and noticed corrosion on the water temperature sensor going into the boiler (flame). the line is copper and i have a water softner unit installed. Wondering what could be the cause of the corrosion from the line and sensor messing up.