FieldBench
Carrier codes

Carrier

Limit / rollout

Protect

Overheat or flame containment

Restricted secondary raises head and can open rollout / limit.

Walk Limit / rollout in Diagnose

Sign in for the next measurement

First check

1 Treat this as flame outside the exchanger

Do not reset the Carrier 58MCA 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

  • Inspect the secondary before you replace a limit.
  • Chimney-style thinking is wrong — these are 90% collectors.

Plates that use Limit / rollout