HVAC Troubleshooting — What Your System Is Trying to Tell You

Runs a few minutes then shuts off: the limit switch is tripping from restricted airflow or a failing blower — fix the airflow, not just the switch. Blows cold air: ignition failure or a flame sensor that needs cleaning. Loud at startup: delayed ignition or a worn blower bearing. Each symptom points to a specific set of causes, and we test rather than guess.

Running but not cooling: capacitor, refrigerant, coil, or compressor issues — diagnosed in order of probability and verified with gauges, not vibes. Freezing up: airflow or charge problems that will destroy the compressor if ignored. High bills with weak cooling: usually a slowly failing system or duct leakage we can measure.

Kettling and banging: scale buildup or trapped air in the loops. One cold zone: a stuck zone valve or failed circulator — the two parts we stock most. Pressure keeps dropping: a leak somewhere in the system, which we trace and fix rather than just repressurizing monthly.

DIY has its place — check your filter, your breakers, and your thermostat batteries first. But refrigerant, combustion, gas, and pressurized hydronic systems are not DIY territory, and misdiagnosis costs more than the service call. When the simple checks don't solve it, our licensed techs will find the real cause.