Minnesota E4 Freeze protect air coil, Waterfurnace series 7

Discussion in 'Maintenance and Troubleshooting' started by StirlingSilver, Jan 14, 2021.

  1. StirlingSilver

    StirlingSilver New Member

    Has anyone else received this error on a series 7 water furnace unit? Also, has anyone ever had to replace their air coil? We have had frost issues on the air coil in the past. I am receiving this error now but inspected the air coil and it does not have any frost on it. Incoming water temp is 40.2, outgoing 38. We even added two additional vertical loops to our vertical field a year ago as the field was undersized by the installer from the get go. Any advice greatly appreciated.

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