Gas pressure was too high & cutting off the heating when the panel was on. Adjusted it to the manufacturer’s specifications & system was heating without shutting off with the panel on. Noticed there was a gas smell so I began checking carbon monoxide with my meter & immediately was getting 25ppm & above in the closet. Vent pipe had a hole on the back side from rusting out. Saw there was also tape falling off where a draft hood should’ve been & they had cut it & “fit the edges” around the exhaust & taped over it. Customer wants an estimate to replace the entire vent pipe. Signed up for membership.