HVAC Refrigeration Guide — R-454B

Crankcase Heater Failure: Diagnosing Migration, Flooding & Slugging

Sep 09, 2026

A dead crankcase heater rarely announces itself — it shows up weeks later as a failed compressor. This guide helps HVACR technicians distinguish migration, flooding, and slugging, field-diagnose heater failures, and navigate new A2L system considerations for R-454B and R-32.

Tags: A2L refrigerants, compressor diagnosis, compressor flooding, crankcase heater, HVACR troubleshooting, R-32, R-454B, refrigerant migration, refrigeration service, slugging

How to Read Superheat and Subcooling Together

Sep 02, 2026

Superheat says low charge. Subcooling says overcharge. You don't have a gauge problem — you have a metering device or airflow issue. Learn how to read both numbers together using the four-quadrant diagnostic to pinpoint the real fault fast.

Tags: A2L refrigerants, fixed orifice, HVAC diagnostics, metering device, R-454B, refrigerant charging, refrigeration, subcooling, superheat, TXV