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 Check all tubing connected to the pressure switch for cracks or disconnection
- 2 Make sure the tubing isn't pinched or restricted
- 3 Look for any water or debris in the tubing
- 4 Reset the furnace control board
📞 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: Check all tubing connected to the pressure switch for cracks or disconnection. Make sure the tubing isn't pinched or restricted. Pressure switch recalibration or replacement requires professional service and diagnostic equipment.
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