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water in furnace

drhvac Member Posts: 190
customer had no heat on a very cold snowy night here in the northeast the other day, but it started working erratically, and was working when I got there the following morning. I checked and cleaned all the drain hoses and trap. I checked the gas pressure, pressure switch pressures, and did a combustion test on it, everything was fine. The combustion inlet pipe is kind of low to the ground and I think a snow drift might have temporarily blocked it causing the erratic heat operation. Inside the furnace it was wet, not on the bottom where the blower is, but up in the burner compartment in the front of the heat exchanger where the drain hoses come out of the secondary heat exchanger. Nothing was obviously leaking, no stains of water or anything, but the tray was wet and it was rusted like it has been wet before. Any ideas? Can't be the secondary heat exchanger or I would probably see water on the bottom? This is a Ruud 90% about 10 years old.



  • Harvey Ramer
    Harvey Ramer Member Posts: 2,239
    Is the

    furnace sitting in a cold environment? Could be condensing every time it turns on. Also check your return air temp and make sure nothing funny is going on there.

  • drhvac
    drhvac Member Posts: 190

    is in a basement
  • Ironman
    Ironman Member Posts: 7,373
    Flue Inlet

    Does the intake pipe pass through an unseated area? Could be condensation. Are pipes terminated properly? Could also be flue gas reversion.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • drhvac
    drhvac Member Posts: 190
    the piping

    It's in the basement, so it's not in a cold area. Also the combustion intake is on the top right side of the furnace where the leak is on the bottom left, so it's not close.