BRYANT DIAGNOSTIC REFERENCE STATUS LED — SHORT + LONG FLASH CODES DOC BRYANT-13

Bryant furnace: Code 13 — Limit Circuit Lockout

Q: What does code 13 mean on a Carrier furnace?

Code 13 — Limit Circuit Lockout. A limit, draft safeguard, flame rollout, or blocked-vent switch stayed open longer than 3 minutes → lockout. Auto-resets after 3 hours. Root causes = see code 33.

YOUR LIGHT: 1 SHORT + 3 LONG FLASHES — MATCH IT ABOVE

Try DIY first, then call a pro

Bryant furnaces share the Carrier control platform — this code table applies to the equivalent Bryant models. Confirm against your unit's panel label.

What does code 13 mean on a Carrier furnace? A limit, draft safeguard, flame rollout, or blocked-vent switch stayed open longer than 3 minutes → lockout. Auto-resets after 3 hours. Root causes = see code 33.

GOOD NEWS: THE FIRST CHECKS ARE FREE AND TAKE MINUTES.

Try these first — in this order

Same first moves as code 33: filter and vents.

1Check: Everything under code 33 (airflow/vent restrictions), sustained 3+ minutes

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Recurring lockouts need heat-exchanger and venting inspection. DIY part cost: $5–25 — a pro visit for this class of fault typically runs $150–350.

What causes it (in order of likelihood)

Everything under code 33 (airflow/vent restrictions), sustained 3+ minutes DIY-CHECKABLE

Parts referenced by this code

Air Filter (check size on the old one)

$5–25

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Always match parts against your model's parts list — part numbers vary within a series.

Applies to

58STA · 58STX · Bryant 310/311/312 系 · Payne PG8M 系

Different Bryant generations use different code maps. If your series isn't listed, don't assume this meaning — check your blower-door label.

Verified against Carrier 58STA/58STX Installation & Service Instructions (1106202L), p.37/48 — “auto-reset after 3 hours. See code 33”

Last verified 2026-07-06 · how we verify