San Diego winters are mild, so many heaters sit idle for months and then get switched on during the first cold snap. That's when small problems show up. Here are five signs your heater needs a repair, and what each one usually means.
1. Inconsistent heat from room to room
If one room is warm while another stays cold, the cause may be a dirty filter, closed or blocked vents, leaky ductwork, or a blower that isn't moving enough air. Start by replacing the filter and opening every vent. If rooms are still uneven, a technician can check airflow, the blower and the ducts.
2. Strange noises
A soft hum and the sound of air moving are normal. Banging, scraping, squealing or loud rattling are not. Squealing often points to a worn blower motor bearing or belt, rattling to a loose panel or part, and a loud bang at startup can mean delayed ignition (see sign 5). Turning the system off and having it checked early usually keeps a small repair from becoming a large one.
3. Rising energy bills
If your gas or electric bill climbs while your habits stay the same, your heater may be working harder than it should. Dirty burners, a clogged filter, a failing component or leaky ducts can all waste energy. An annual tune-up catches most of these.
4. Dusty or stale indoor air
A heater that hasn’t been serviced can spread dust and pollen through the house, and you may notice more dust on surfaces, a musty smell, or stuffy air when the heat runs. A new filter, a cleaned blower and, where needed, duct cleaning can make a noticeable difference.
5. Delayed ignition or a yellow flame
On a gas furnace, the burners should light smoothly within a few seconds and burn with a steady blue flame. A delay followed by a pop or bang, or a yellow, flickering flame, can signal dirty burners or a combustion problem. These are safety issues, so have them inspected promptly.
Safety first: If you smell gas or a carbon monoxide alarm sounds, leave the home right away and call 911 or SDG&E from outside. Make sure you have working carbon monoxide alarms near bedrooms and on every level of your home.
When to call for a repair
If a new filter and a thermostat check don't fix the problem, it's time for a professional diagnosis. Precision Air Inc repairs furnaces, heat pumps and ductless systems across coastal North County and San Diego County, and we service all major brands. Learn more about our heating and furnace services.
Need service? Call (760) 858-8000, Monday–Friday 8–5, or send us a message.