Thermistor
Temperature sensors on mini-splits and heat pumps.
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.
How to Clean a Mini-Split: Filters, Coil, Blower Wheel and Drain
How to deep clean a ductless mini-split indoor unit, including the coil, blower wheel and drain, plus the outdoor unit, with the right tools and without damaging the electronics.
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.
How to Test a Mini-Split Thermistor (Temperature Sensor)
Test a mini-split room, coil, discharge or outdoor temperature sensor with an ohmmeter and the manufacturer's resistance table, and find out whether the sensor, wiring or board is bad.