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I'm have a toilet drain running in the ceiling of my kitchen, then into the exterior 2x4 kitchen wall. In this transition from horizontal to vertical, the 3" copper pipe has a long sweep (two 45s connected by a short straight section). This runs in front of the top plate of the wall. It...

We have a 25 month old A.O. Smith PowerShot. Works nicely. Most of the time. Sometimes, the LEDs on the front indicate "System in Lockout" (according to the manual). After a few resets, and/or a few hours, the problem fixes itself. The manual gives four possible reasons for the specific...