FieldBench
Carrier codes

Carrier

4-flash

Hazard

IGC 4-flash — example

Example: rollout / aux limit on many CES stickers; consecutive limit on others. Read THIS IGC.

Walk 4-flash in Diagnose

2 plates — walk the one on the cabinet

First check

1 Treat this as flame outside the exchanger

Do not reset the Carrier 48FC 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

  • Do not jump a rollout. CO the space below.
  • Heat exchanger, flue, inducer, burner alignment.

Plates that use 4-flash

Same number, other makers

4-flash on Carrier is not the same code on these plates.