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bhishman
Sep 27, 2009, 09:23 AM
HVAC

ruud furnace 1st heat use this year flashing error code 57. Have checked drain line and that condensation vent is filled. Any other suggestions before I replace the high pressure switch.
Thanks
T-Top
Sep 27, 2009, 06:20 PM
not for sure what your saying about condensation vent is filled. If you have water in the line backing up that's your problem. if not check for a restriction in the vent or combustion air pipe.