Carrier
Soft Lockout Due to Repeated Faults
Furnace starts, runs for a while, then shuts off and will not restart for an hour or more.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Repeated ignition failures, intermittent pressure switch operation, overheating and limit trips, marginal flame sensing
How to Fix / Troubleshooting
Safety first: Turn off power and gas before inspecting internal components.
- Observe LED codes: When the furnace is off but the LED is flashing, note the code and refer to the Carrier label to identify the underlying issue (e.g., 14, 21, 31, 33).
- Address root cause: Clean flame sensor, replace dirty filter, clear condensate trap, or inspect venting as appropriate for the code.
- Power reset: Turn off power for 30 seconds to clear the soft lockout, then restore and monitor operation.
If lockouts continue, a professional should perform a full diagnostic of combustion, airflow, and controls.
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Repair Difficulty
Medium
3/5
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