Carrier · Furnace / HVAC
13 Pressure switch stuck
What this code means
The pressure switch that confirms the inducer motor is drawing exhaust properly isn't closing when it should.
Most likely causes
- Blocked or frozen exhaust vent pipe
- Failing inducer draft motor
- Condensate line clogged, backing pressure into the switch
What to try first
Check the outside exhaust vent cap for snow, ice, or debris blocking it and clear any obstruction.
Safety note: if this code returns after one clean reset, stop resetting it — repeated lockouts usually mean a real fault that needs a licensed technician. Never bypass a safety switch.
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What does Carrier error code 13 mean?
Pressure switch stuck. The pressure switch that confirms the inducer motor is drawing exhaust properly isn't closing when it should.
Can I fix Carrier code 13 myself?
Usually not. Check the outside exhaust vent cap for snow, ice, or debris blocking it and clear any obstruction. If the code returns after one reset, it needs a licensed technician.
What causes Carrier code 13?
The most common causes are: blocked or frozen exhaust vent pipe; failing inducer draft motor; condensate line clogged, backing pressure into the switch.
Other Carrier furnace codes
All Carrier furnace error codes →
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This information may contain errors or not apply to your exact model — always double-check it against your appliance's own manual before acting. If there's any chance of a gas, fire, electrical, carbon monoxide, or other safety hazard, stop and call a licensed professional or the appropriate agency (e.g. your gas utility) instead of relying on this page alone.