Error Code Code 32

Carrier 58MVP Error Code Code 32: Low Pressure Switch Fault

TL;DR
Indicates the low pressure switch (LPS) is closed at call for heat, or fails to close after call, or opens during operation. When the furnace control board flashes Fault Code 32, the unit shuts down, waits 2 minutes, stops flashing Fault Code 32, and restarts the heating cycle. Most likely cause: plugged condensate drain.
Disclaimer
This article is for informational purposes only and does not guarantee the accuracy or completeness of the information provided. Always turn off power and gas supply before attempting any repairs. If you smell gas, leave immediately and call your gas company. Consult a licensed HVAC technician for diagnosis and repair. Any actions taken based on this information are at your own risk.

What Does Code Code 32 Mean?

Indicates the low pressure switch (LPS) is closed at call for heat, or fails to close after call, or opens during operation. When the furnace control board flashes Fault Code 32, the unit shuts down, waits 2 minutes, stops flashing Fault Code 32, and restarts the heating cycle.

Common Causes

Cause Likelihood DIY?
Plugged condensate drain Most common ✓ DIY fix →
Water in vent piping, possibly sagging pipe Common ✗ Call a pro →
Improper pressure switch wiring or pressure switch tubing connections Common ✗ Call a pro →
Failed or out-of-calibration pressure switch Common ✗ Call a pro →
Sag in vent pipe or clogged drain trap or line Common ✗ Call a pro →

When to Call a Professional

Contact a licensed HVAC technician if:

Sources

  1. Carrier 58MVP Service and Maintenance Manual, p.11 – LED Codes
  2. Carrier 58MVP Troubleshooting Guide, p.22–23 – Fault Code 32