Error code reference
Carrier Furnace Error Code 13
Limit circuit lockout occurs if the limit, draft safeguard, flame rollout, or blocked vent switch is open…
Limit circuit lockout occurs if the limit, draft safeguard, flame rollout, or blocked vent switch is open longer than 3 minutes; control will auto-reset after three hours.
First step from the service manual
Refer to status code 33 checks.
The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.
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- Step-by-step tests with expected resistance, voltage, and continuity values
- Wiring diagram references and connector pinouts from the OEM service manual
- Verified part numbers when replacement is required
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