My Bryant Plus 90 gas furnace has water leaking from one of the pipes that is clamped tight . It is connected to the exterior. Is there any reason why would there be water in the pipe? If so, how do we stop the water from flowing into the furnace? Thank you for reading and would appreciate suggestions for solving this problem.

Starwalker

Yes it is normal for water to be in the line BUT it is supposed to drain back to the unit and then to the drain.

The item you are talking about is called condensation and it is from the condensate from the efficient furnace you have.

Normally this water does not build up in the pipe but goes down the drain right at the furnace.

You will need to start by checking the drain on your furnace and make sure it is all clear. Next step is to check the pipes going outside to make sure nothing is restricting the flow going in or out of the pipes. If you have a high snow level that could be a problem or if rain or other water can get in that will also need to be checked.

Check the drain on the furnace!
Check the pipe going outside for any obstruction!

That is all there is to it. If you cannot figure it out I suggest you call for professional help.

There is a reservoir that the condensation goes through and it can become clogged over time. Remove and flush to clear passage.