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Carrier 59SC6A code 331: detected condition and safe next step

Code 331 means the controller detected main limit circuit open. It does not prove a root fault.

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Report a technical correction or contact the project through thecorrection issue form. Do not include personal, account, or equipment-owner information.

Exact scope

Carrier 59SC6A selected documented revisions using this furnace-control emitter.

Emitter: carrier-59sc6a-ifc
Observation mode: ACTIVE

Candidate causes

Manufacturer sequence; not probability or prevalence.

Restricted airflow
Limit-switch fault