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Errors


Boiler type ATI-240H-N Outdoor (T-H3J-OS)

Error code 311

Cause:

Outlet thermistor failure (240 (T-H3J) /340 (T-H3S) models only) Heat exchanger thermistor failure (540 (T-H3) model only)

Solution:

• Check for connection/breakage of wires and/or debris on thermistor (Part #407, 408, 411, 715).