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Errors


Boiler type ATI-240H-N Indoor (T-H3J-DV)

Error code 121

Cause:

Loss of flame

Solution:

• Check if the Hi-limit switch (Part #412) is properly functioning.
• Check for connection/breakage of wires (Part #413, 708, 709, 710, 712), burn marks on the computer board (Part #701), and/or soot on the flame rod (Part #108).
• Check ifthere isleaking fromheat exchanger(Part #401)