I had a gentleman come up to my vehicle, he saw my signs and sued if I had a minute. He wanted to know if I routinely looked inside the heat exchanger on forced air units. I told him no, not unless there is a opening I can get my camera into. He expedites the move in and out of properties, a concierge service of sorts. He proceeded to tell me of the problems another inspector caused him. Apparently the inspector removed something in order to get a look inside the heat exchanger. In the process he disconnected a hose. He thought to the humidifier but I suspect to the condensate pump. It was a week before the seller noticed water in the basement. It had run to a carpeted area and soaked the rug. The furnace repair cost him about 1200 because the circuit board also got fried in the process. The inspector claimed he did nothing wrong and refused to pay. How far do you go when inspecting a furnace?