San Diego, CA Furnace Repair

If your furnace doesn’t start at all, the issue could stem from a tripped breaker, a failed control board, or a safety switch lockout caused by another component malfunction. Thermostat wiring problems are also common culprits. Our technicians trace the electrical path, test voltage and signal continuity, and reset or replace damaged parts so your system starts safely and reliably.

When some rooms are warm and others stay cold, airflow is likely being restricted. A dirty air filter, blocked duct, or failing blower motor can all reduce circulation. In San Diego homes, dust and pet hair often build up inside ducts after long periods of disuse. We inspect and clean the blower assembly, replace filters, and check duct pressure to restore even heat distribution throughout your home.

If you hear banging, screeching, or rattling when the furnace runs, it’s often caused by loose duct joints, worn bearings in the blower motor, or delayed ignition from dirty burners. These noises are signs of mechanical wear or incomplete combustion. We tighten fittings, clean burners, lubricate components, and replace any damaged parts to stop the noise and prevent further damage.

A furnace that keeps switching on and off without completing a full cycle may be overheating or struggling with poor airflow. This often happens when filters are clogged, vents are blocked, or sensors are misreading temperature. We inspect airflow, test the limit switch, clean flame sensors, and recalibrate controls so the system cycles properly again.

Unusual odors—like burning, metallic, or musty smells—can mean different problems depending on their source. Dust burning off after months of inactivity is common, but persistent smells may indicate overheating wires, mold in the ducts, or a motor issue. We locate the source, clean or repair affected parts, and make sure your system operates safely without lingering odors.