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Furnace Repair in Antioch

The short answer

Antioch furnaces most often fail at the ignitor, flame sensor, pressure switch, inducer motor or blower. We diagnose the fault, check the heat exchanger and venting for safety, and repair the system before you head into the colder weeks.

Winter in Antioch is short compared with the rest of the country, but the nights still drop into chilly territory, and a gas furnace that has sat idle since spring is often the first thing to complain. EliteFlow HVAC Repair Service handles furnace repair across 94509 and 94531, about 14 miles northeast of our shop in Danville. We work on standard and high-efficiency gas furnaces, older units in hall closets and garages, and attic installations where most of the problems hide behind a pull-down ladder. Here is what usually goes wrong, what the warning signs mean, and how we approach a repair so your heat comes back safely.

Signs your furnace needs attention

Furnaces tend to give a few hints before they stop entirely. Paying attention to them can turn an emergency into a scheduled visit.

  • The blower runs, but air at the registers feels cool or barely warm
  • The burners light, then shut off after a few seconds, and the cycle repeats
  • A clicking ignitor that never produces a flame
  • A burning dust smell that lingers well past the first start of the season
  • Rattling, squealing or booming sounds when the furnace lights
  • A flashing status light on the control board inside the cabinet

Common causes we find on Antioch service calls

Because heating season here is relatively brief, furnaces spend most of the year sitting still. Dust settles on the flame sensor, spiders nest in the burner area, and condensate lines on high-efficiency units dry out or clog. When the system finally fires up in November, those small issues show up all at once.

A dirty flame sensor is one of the most frequent culprits: the furnace lights, cannot prove the flame, and shuts the gas valve as a safety measure. Hot surface ignitors crack with age. Inducer motors wear their bearings and start to whine. Pressure switches fail or trip because a vent is partly blocked or a condensate trap is full. And in attic furnaces, a blower motor that worked hard through summer cooling may be on its last legs when heating season arrives.

Safety comes first on every repair

Any furnace repair includes a look at the parts that keep combustion gases out of your living space. We inspect the heat exchanger for cracks or rust-through where we can see it, confirm the flue or PVC vent is connected and pitched correctly, and check for proper draft. We also test for carbon monoxide around the appliance.

If something looks unsafe, we explain exactly what we found and why it matters. We will not leave a system running in a condition that could put your household at risk. Every home with a gas appliance should also have working CO alarms; if you do not, that is an easy and inexpensive improvement to make this week.

When an older furnace is near the end

A lot of Antioch homes still have the furnace that came with the house. Many of these are worth repairing, and a new ignitor or inducer can buy years of service. But a cracked heat exchanger, repeated control board failures or a unit that has been patched many times can make a replacement the better choice.

If you do plan a replacement, Air District rules may shape your options. Working equipment does not have to be replaced, but gas furnaces manufactured from 2029 must meet a zero-NOx standard, so a heat pump is worth comparing when the time comes. BayREN and your local clean energy provider may offer heat pump incentives depending on current funding; we check what is active before quoting.

Getting ready for the season

The best time to find a weak ignitor is before you need heat. A fall check that includes cleaning the flame sensor, testing the ignitor, verifying gas pressure and inspecting the vent gets most furnaces through the season without a call. We offer the same visit to homeowners in Brentwood, Clayton, Concord, Walnut Creek and Pleasant Hill.

More services in Antioch

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What to expect

How a visit goes

  1. Clear findings

    We show you the failed part or the reading that points to it, and explain what it means for the rest of the system.

  2. Choices, not pressure

    Repair, replace or wait and watch: you get the trade-offs of each and make the call yourself.

  3. Care for your home

    Shoe covers, drop cloths and a clean work area when we leave, whether the job was in the attic, garage or hall closet.

FAQ

Common questions

Why does my furnace light and then shut off right away?

That pattern usually points to a dirty or failing flame sensor, though a vent problem or a faulty pressure switch can cause it too. A technician can confirm which one by testing the sequence.

Is a burning smell normal when I turn on the heat?

A short burning dust smell on the first run of the season is normal. If it persists, smells like melting plastic, or comes with smoke, turn the furnace off and call for service.

Can you repair high-efficiency furnaces?

Yes. We repair condensing furnaces, including their condensate traps, drain lines, inducer motors and pressure switches, which are common trouble spots.

What should I do if my CO alarm goes off?

Leave the house, call 911 or the gas utility from outside, and do not go back in until it is cleared. Then call us to find and fix the cause before using the furnace again.

Do I have to replace my old furnace because of the new Air District rules?

No. The rules do not require replacing working equipment. They apply when a furnace fails or is replaced, and the zero-NOx standard covers furnaces manufactured from 2029.

Do you work in attics and crawl spaces?

Yes. Many Antioch furnaces are in attics, and we are set up to diagnose and repair them there.

Tell us what your system is doing

Describe the noise, the smell or the temperature problem when you reach out, and we will schedule a technician with the right parts for your equipment.

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