The short answer
AllPro HVAC Services repairs gas furnaces in Alhambra, CA, including ignition failures, airflow problems, short cycling, and safety shutoffs, with 24/7 emergency service available. If you are deciding between repair and replacement, check the current South Coast AQMD furnace rule and your utility's heat pump rebates before you choose.
Alhambra winters are mild, so most furnaces here sit idle for months and then get asked to work on the first cold night of the season. That pattern causes its own set of problems: dust on burners, weak igniters, clogged filters, and thermostats nobody has touched since spring. AllPro HVAC Services repairs gas furnaces for homes across Alhambra, in the 91801 and 91803 ZIP codes, about 5 miles east of our Los Angeles base. We find the actual cause, explain it in plain terms, and fix what needs fixing. If your heat goes out at night or over a weekend, we offer 24/7 emergency service.
Common Furnace Problems in Alhambra Homes
Los Angeles has a Mediterranean climate with dry summers and mild winters. In inland San Gabriel Valley cities like Alhambra, that means a furnace may run only a few weeks a year. Long idle stretches let dust settle on burners and sensors, and parts that wear slowly tend to fail the first time the system is asked to run hard.
These are the issues we see most often when a furnace won't heat or won't stay on:
- Igniter that is cracked or too weak to light the burners
- Dirty flame sensor that shuts the burners off a few seconds after they light
- Clogged air filter that restricts airflow and trips the high-limit switch
- Short cycling, where the furnace turns on and off every few minutes
- Blower motor or capacitor problems that leave the burners running with no air moving
- Thermostat wiring, settings, or dead batteries that keep the call for heat from reaching the furnace
- Burning smell on startup that lasts longer than the first run of the season
- Rattling, squealing, or booming sounds when the furnace starts
What Happens During a Repair Visit
We start by asking what you noticed: when the problem began, whether the furnace lights at all, and any error codes blinking on the control board. Then we check the thermostat, the filter, the ignition sequence, the flame sensor, gas pressure, the blower, and the safety switches. We also look at the venting, since a blocked flue can cause shutdowns and is a safety concern.
Once we know the cause, we tell you what is wrong, what the repair involves, and whether other parts are close to failing. You decide before any work is done. Many fixes, like cleaning a flame sensor or replacing an igniter, can be handled in the same visit when the part is on hand.
When a Furnace Problem Is a Safety Issue
If you smell gas, leave the house first, then call your gas utility or 911 from outside. Do not flip switches or try to relight the furnace. If a carbon monoxide alarm sounds, or people in the home feel dizzy, nauseated, or headachy when the heat is running, get everyone outside and call 911.
After the immediate danger is handled, we can inspect the furnace for cracked heat exchangers, venting problems, and other causes. Every home with a gas furnace should have working carbon monoxide alarms, and the start of the heating season is a good time to test them.
Repair or Replace? Know the Local Rules First
Most furnace problems are worth repairing. But if your system is old and needs a major part, it helps to know the rules before you replace it. South Coast AQMD Rule 1111 limits NOx emissions from natural-gas fan-type central furnaces sold and installed in the Los Angeles region, and the district has been amending it toward zero-emission requirements. The district sets and revises the compliance dates, so check the current rule before planning a replacement.
A heat pump is one alternative. LADWP residential electric customers can apply for rebates on qualifying heat pump systems, filed after purchase and installation and within 12 months of purchase. Alhambra is outside the City of Los Angeles, and many homes outside the city are served by Southern California Edison instead, so available rebates depend on the utility serving your address. We confirm the current offer before quoting it. The federal 25C tax credit covered qualifying heat pumps placed in service before December 31, 2025, and is not available for new installations after that date.
Serving Alhambra and Nearby Cities
We handle furnace repair throughout Alhambra and in nearby South Pasadena, San Gabriel, Monterey Park, San Marino, and Pasadena. Whether your furnace is in a hall closet, attic, or garage, we can diagnose it and walk you through your options.
More services in Alhambra
- AC Repair in Alhambra
- Heating Repair in Alhambra
- Heat Pump Installation in Alhambra
- AC Installation in Alhambra