The short answer
PrimeAir HVAC Repair Service repairs gas furnaces in homes throughout Hayward, with 24/7 emergency service. We find the failed part, explain your options, and help you weigh repair against replacement under current Bay Area Air District rules, which do not require you to replace a working furnace.
Hayward winters are mild compared with much of the country, but a damp, chilly night feels much colder when the furnace won't light or keeps shutting off. PrimeAir HVAC Repair Service sends technicians from our Fremont base, about 5 miles away, to homes across Hayward in ZIP codes 94541, 94542, 94544, and 94545. We diagnose gas furnaces, find the part that actually failed, and explain whether a repair makes sense before any work starts. Emergency service is available 24/7.
Common furnace problems in Hayward homes
In a mild climate, many furnaces sit unused for months and then run hard on cold mornings. During those idle stretches, dust settles on burners and sensors, and small problems stay hidden until the first cold snap. These are the issues we see most often:
- Furnace blows cold air, often caused by a dirty flame sensor, a worn igniter, or a tripped limit switch
- Burners light and then shut off after a few seconds
- Short cycling, where the furnace turns on and off far more often than normal
- Blower runs nonstop or doesn't run at all
- Banging, squealing, or rattling at startup
- A flashing error code on the control board
- Clogged condensate drains on high-efficiency furnaces, which can shut the system down
What happens during a repair visit
We start with the basics: thermostat settings, the filter, power to the unit, and gas supply. Next, we read any error codes and test the ignition sequence, flame sensing, safety switches, inducer motor, and blower. We also look over the venting and the heat exchanger area and check for carbon monoxide, because a furnace that runs isn't always a furnace that's safe.
Before any repair begins, we tell you what we found, what we recommend, and what your options are. Nothing gets done until you approve it. If the part you need is on the truck, the repair can usually be finished on the same visit. If the part has to be ordered, we tell you what to expect and leave the furnace in a safe condition in the meantime.
Repair or replace? How Bay Area air rules factor in
The Bay Area Air District's appliance rules do not require you to replace a furnace that still works. They apply only when an existing furnace fails or is replaced. If your furnace can be repaired safely at a reasonable cost, repairing it is a valid choice.
Planning ahead still helps. Under the Air District's Rule 9-4, natural gas furnaces manufactured from 2029 onward must meet a zero-NOx emission standard. In practice, that points homeowners toward heat pumps for replacements after that date. If your furnace is older and needing frequent repairs, we can talk through whether it makes sense to fix it now and plan a heat pump later.
The federal Energy Efficient Home Improvement Credit (25C) covered qualifying heat pumps placed in service before December 31, 2025, and it isn't available for new installations. You can check BayREN and your local clean energy provider for current heat pump and electrification incentives. Those programs change with each funding cycle, so we confirm the current offer before quoting it.
Quick checks before you call
A few simple checks can sometimes restore heat. If none of these solve the problem, call us.
- Confirm the thermostat is set to Heat and set above the current room temperature, and replace its batteries if it uses them
- Check the air filter and replace it if it's clogged
- Make sure the furnace's power switch, which often looks like a light switch, is on and the breaker hasn't tripped
- Make sure the furnace door panel is fully seated, since many units won't run with it loose
- Make sure the gas valve to the furnace is in the on position
When a furnace problem is an emergency
If you smell gas, leave the house right away. Don't flip switches or use anything that could spark, and call your gas utility or 911 once you're outside. If a carbon monoxide alarm goes off, get everyone out and call 911.
Other problems are urgent even when they aren't dangerous. A house with no heat is hard on infants, older adults, and anyone who is ill. Our 24/7 emergency service covers no-heat calls, repeated shutdowns, and burning smells that don't fade after the first few minutes of use.
Serving Hayward and nearby cities
We handle furnace repair throughout Hayward, from the flatlands to the hills, and in nearby Union City, San Leandro, Newark, Foster City, and Redwood City. Because Hayward is a short drive from our Fremont base, we can reach most homes quickly when the heat goes out.
More services in Hayward
- AC Repair in Hayward
- Heating Repair in Hayward
- Heat Pump Installation in Hayward
- AC Installation in Hayward
