FieldBench
Carrier codes

Carrier

33

Protect

Limit or rollout open

Airflow or flame-containment. Dirty A-coil on an 80% is the winter/summer crossover call.

Walk 33 in Diagnose

7 plates — walk the one on the cabinet

First check

1 Treat this as flame outside the exchanger

Do not reset the Carrier 58SP0 rollout and walk away. Write the code, kill the call, and look for flame at the burners, crossover, and vestibule before you do anything else.

Expect: No flame outside the exchanger. Burners seated. Crossover lit.

If pass: Still inspect secondary / flue / condensate before you reset.

The rest of the walkthrough is Diagnose.

On the plates

  • Filter, VS heat CFM (setup switches / model plug), coil, return.
  • Rollout is manual reset — inspect exchanger before you reset.
  • Three minutes → 13.
  • Filter, coil, return, heat tap (59SC5) or 18-speed heat selection (59SC6).
  • Do not pull a 59TP6 model-plug CFM table onto this motor.
  • Held open → 13.
  • Filter, blower speed, A-coil on top of the furnace — 80% coils load up and limit.
  • Rise vs plate. Rollout: exchanger / burners / flue. Manual reset.

Plates that use 33

Same number, other makers

33 on Carrier is not the same code on these plates.