Diagnostics, measurements and repair of HVAC-R refrigeration systems.
Indoor HVAC blower not running? Troubleshoot thermostat calls, 24V controls, relay, capacitor, PSC/ECM motor, board, safeties and airflow.
Low HVAC-R head pressure? Evaluate ambient, load, condenser airflow, undercharge, restrictions and compression using complete system measure...
HVAC static pressure testing guide: TESP, test ports, filters, coils, ducts, blower setup and manufacturer-based interpretation.
Commercial ice machine not making ice? Troubleshoot water supply, freeze cycle, float, harvest, condenser, sensors and refrigeration operati...
Furnace not igniting or producing heat? Troubleshoot thermostat calls, ignition sequence, pressure switch, igniter, flame signal, gas and sa...
AC outdoor fan not spinning? Safely troubleshoot thermostat calls, contactor, capacitor, motor, voltage, controls, airflow and operating pre...
Heat pump blowing cold air in heat mode? Troubleshoot defrost, thermostat, reversing valve, airflow, auxiliary heat and the refrigerant circ...
Compressor hums without starting and trips overload? Diagnose voltage, capacitor, relay, overload, windings, pressures and locked rotor safe...
AC running but not cooling? Field troubleshooting for thermostat settings, airflow, evaporator and condenser coils, refrigerant circuit and ...
HVAC 3A or 5A fuse keeps blowing? Field method to isolate thermostat wiring, contactor coils, accessories, equipment wiring and the 24V tran...
How do you test a grounded compressor? HVAC-R guide to C-R-S terminals, winding resistance, insulation, overloads, voltage and start compone...
TXV underfeeding, overfeeding or hunting? HVAC-R guide to bulb mounting, equalization, charge, restrictions, sizing, subcooling and adjustme...
Why does an AC breaker keep tripping? A 2026 guide to overloads, shorts, capacitors, motors, compressors, wiring and safe HVAC measurements.
Compressor running hot? A guide to high discharge temperature, superheat, compression ratio, charge, condenser conditions, motor cooling and...
Thermostat screen blank? A 2026 HVAC guide to batteries, breakers, switches, doors, drains, float switches, fuses, transformers and C-wire p...
Low suction and high head pressure? A field guide to compression ratio, airflow, condenser conditions, restrictions, metering devices, charg...
AC humming, hard starting or shutting down? A field guide to identifying and testing a bad HVAC capacitor without guessing or replacing part...
Why does an evaporator coil freeze? A field guide to airflow, filters, blower operation, charge, restrictions, saturation temperature and su...
Why is a mini split leaking water inside? A 2026 field guide to clogged drains, slope, drain pans, pumps, filters, frozen coils and installa...
AC contactor not pulling in? A 2026 guide to troubleshooting the Y call, 24V circuit, transformer, fuse, safeties, coil, contacts and load s...
Walk-in cooler running warm? Use this 2026 field checklist for airflow, defrost, evaporator, condenser, electrical readings, pressures and r...
HVAC-R compressor short cycling? Diagnose controls, pressure switches, airflow, condenser, charge, voltage, safeties and equipment sizing.
Heat pump not cooling? Use this 2026 field checklist for thermostat, airflow, coils, defrost, electrical readings, pressures and refrigerant...
A practical guide to AI-assisted HVAC-R diagnostics: symptoms, measurements, nameplates, P/T charts and service reports in one field workflo...
A clear field method to measure superheat and subcooling, read the P/T chart, verify the charge and diagnose a refrigeration or air conditio...
Canada-wide guide to using an HVAC-R AI assistant with real field measurements: LP/HP, P/T, superheat, subcooling, delta T, photos and servi...
How a specialized HVAC-R AI assistant helps Quebec refrigeration technicians in the field: technical questions, diagnostic paths, P/T, measu...
How to measure and interpret superheat and subcooling on a refrigeration system. Normal values, diagnostics, and troubleshooting.
How to detect early warning signs of a failing compressor: abnormal noises, overheating, high pressure, excessive current draw.
From student to large company. Quotes, work orders, invoicing, refrigerant log — all in one app.