Tag: ruud

All the articles with the tag "ruud".

• Ruud E03 Error Code - Causes & Fix

  31 May, 2026

  E03 on a Ruud tankless water heater means overheat shutdown. Usually caused by low water flow or scale buildup in the heat exchanger.

• Ruud E02 Error Code - Causes & Fix

  31 May, 2026

  E02 means high-temperature or overheat fault. The water heater detected unsafe heat and shut down. Lower the setpoint or check sensors.