Fremont furnaces work hard for only a few months a year, and that is part of the problem. They sit idle all summer collecting dust, then the first cold, foggy morning in November reveals a cracked igniter or a dirty flame sensor. Many furnaces here live in garages, attics or hall closets of 1960s and 70s tract homes, and we know where to look.
Common furnace problems we fix
- Furnace clicks but never lights, or lights then shuts off
- Blower runs but the air is cold
- Burning smell beyond the first few minutes of the season
- Loud bangs at startup (delayed ignition)
- Furnace runs constantly or cycles every few minutes
- Blinking error code on the control board
- Pilot light that will not stay lit on older units
Safety first
Every heating call includes a check of the heat exchanger, venting, gas pressure and carbon monoxide at the supply registers. If we ever find a cracked heat exchanger or a venting problem, we shut the gas off to the furnace, show you what we found and explain your options. We never use a safety finding as a sales pitch.
If you smell gas, leave the house and call PG&E at 1-800-743-5000 first, then call us.
Repair now, plan for later
Bay Area air district rules require new furnaces manufactured from 2029 to be zero-NOx, which in practice means electric heat pumps. You can keep repairing your current gas furnace for as long as it is safe. When it is time to replace it, we will compare a new furnace installation with a heat pump so you make the decision once. Our explainer on the Bay Area furnace and water heater rules covers the details.
Typical costs in Fremont
| Job | Typical range |
|---|---|
| Hot surface igniter | $200–$450 |
| Flame sensor clean or replace | $150–$300 |
| Pressure switch | $250–$500 |
| Inducer motor | $600–$1,200 |
| Control board | $450–$900 |
| Blower motor | $600–$1,400 |
Ranges reflect recent Fremont-area jobs and change with equipment, access and parts. You get an exact, written price before any work starts.
Looking for more than one fix? ComfortFlow is a full-service HVAC company in Fremont, so one call covers heating, cooling and hot water.