What is error A126, Upper Element Error or Relay Stuck Closed?

Error A126 means the heating element or control board failed and the heater was disabled. The following steps can help you check the issue. 

1. Disconnect power to the unit 
2. Check resistance on element per included Ohm Reading Chart 
3. If acceptable ohm reading is present, replace the board 
4. If ohm reading is not as it should be per included chart, replace the board

Zwell is dedicated to getting homes closer to net zero through the installation of new energy-efficient hybrid water heaters. We are not currently equipped to do service or repair visits but we want to be as helpful as possible. Feel free to reach out to us here or for more information, you can contact the Rheem Hybrid Technical Services Department at 800-995-0982.