DIAGNOSTIC · US / en-US

Carrier 59TN6B code 33: detected condition and safe next step

Code 33 means the controller detected limit-circuit fault. It does not prove a root fault.

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Exact scope

Carrier 59TN6B selected documented revisions using this furnace-control emitter.

Emitter: carrier-59tn6b-ifc
Observation mode: ACTIVE

Candidate causes

Manufacturer sequence; not probability or prevalence.

Restricted airflow
Limit-switch fault