Every time your thermostat calls for cooling, a small but critical part called the contactor closes a high-voltage circuit to power on your compressor and condenser fan. Think of it as a heavy-duty light switch controlled by your thermostat’s 24V signal. When a contactor fails, your AC either won’t turn on at all, or it…
If your HVAC system won’t turn on at all — no fan, no heat, no cooling — the problem might be a bad transformer. The transformer steps down your home’s 120V or 240V power to the 24V that runs the thermostat and control circuits. When it fails, everything downstream goes dead. The good news: testing…
When your AC compressor won’t start, it’s easy to jump to the worst-case scenario — a dead compressor that costs thousands to replace. But more often than not, the compressor itself is fine and a much cheaper part is the real problem. Before you start shopping for a new system, work through this checklist. The…
If your furnace lights up and then shuts off after a few seconds, a dirty or failed flame sensor is the most likely cause. The flame sensor is a small metal rod that sits in the burner flame and tells the control board that gas is actually burning. When it can’t detect a flame —…
Every Dallas homeowner knows the drill — your electric bill doubles or triples between June and September. Some of that is just the reality of cooling a house when it’s 105 degrees outside. But if your bill jumped more than usual, or it’s significantly higher than your neighbors’ bills, your AC system might be working…