Carrier Furnace Error Code 43
Pressure switch calibration fault — the control board has detected that the pressure switch is out of calibration or failing.
⚠️ Symptoms You'll Notice
- • Furnace won't start reliably
- • Intermittent ignition attempts
- • System cycles randomly
- • LED flashing 4-3 pattern
What Causes Error Code 43?
🔧 DIY Troubleshooting Steps
- 1 Reset the furnace control board
- 2 Turn the system off and call a licensed HVAC technician.
📞 When to Call a Professional
Pressure switch recalibration or replacement requires professional service and diagnostic equipment.
Estimated repair cost in Albuquerque: $200–$450
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Frequently Asked Questions
What does Carrier Furnace error code 43 mean? ▼
Pressure switch calibration fault — the control board has detected that the pressure switch is out of calibration or failing.
How much does it cost to fix error code 43 in Albuquerque? ▼
Typical repair costs in Albuquerque for Carrier Furnace error code 43 range from $200–$450. Pressure switch recalibration or replacement requires professional service and diagnostic equipment.
Can I fix Carrier error code 43 myself? ▼
Some basic troubleshooting is safe to try: Reset the furnace control board. Turn the system off and call a licensed HVAC technician.. Pressure switch recalibration or replacement requires professional service and diagnostic equipment.
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