Heat Pump Blowing Cold Air
Cool air from the vents in heat mode.
Checking Heat Pump Charge in Heat Mode: What Works in Winter
Why superheat and subcooling targets from cooling don't apply in heat mode, what manufacturers recommend for winter charging, and how to tell if a heat pump is low on charge in heating.
Heat Pump Auxiliary Heat vs. Emergency Heat: When Each Runs and Why Aux Runs Too Much
The difference between auxiliary heat and emergency heat on a heat pump, what's normal, and how to diagnose a heat pump that runs on aux heat constantly or never brings it on.
Heat Pump Defrost: How It Works and How to Troubleshoot It
How heat pump defrost works on time-temperature and demand defrost boards, what's normal during defrost, and how to diagnose a heat pump that ices up or defrosts too often.
Mini-Split Not Cooling or Heating: A Diagnostic Order for Ductless Systems
How to troubleshoot a ductless mini-split that runs but won't cool or heat: error codes, mode and remote settings, filters and blower wheels, the outdoor unit, sensors, communication and charge.
Heat Pump Blowing Cold Air in Heat Mode: What's Normal and What's Not
Tell normal heat pump behavior (cool-feeling air, defrost) from real faults like reversing valve, O/B setup, low charge and aux heat problems.