Getting excess water drip and steam backing up into rafters. Coming from heat pipe out of roof only after new roof, why? the company came and shortened the stack as it was pressed against the top of the boot on the roof. Thought that was it. Checked it a few days later and it was full of dampness from steam again. We’ve had no rain since I last blew a fan and dried it. It was cold last night and the unit came on. the other trane unit has no vapors like this and is perfect. but the hole cut out is smaller. not sure if excess gas burn-off or what. I don't smell any out of the pipe or inside. Needs a bigger vent out the top? they cut this big square hole but left the other alone and I have issues with this one only.