Common problemsSafety firstBefore you callRepair or replaceFAQ
Forced-air gas furnaces fail in predictable ways, and most no-heat calls come down to ignition, airflow or a safety switch doing its job. We find which one before replacing parts.
Common Furnace Problems We Fix
Won’t ignite
A failed hot-surface igniter, dirty flame sensor or gas valve problem.
Starts, then shuts off
Often a dirty flame sensor, a pressure switch, or a limit switch tripping from low airflow.
Blowing cold air
Ignition failure, the thermostat fan set to ON, or the furnace overheating and shutting its burners off.
Short cycling
A clogged filter, an oversized furnace or a poorly placed thermostat.
Loud noises
Blower or inducer motor wear, or delayed ignition – which should be checked promptly.
Burning or odd smells
Dust burning off at the first cold snap is normal briefly; persistent burning or any gas smell is not.
Safety First
If you smell gas or a CO alarm sounds
Get everyone out of the house right away. Don’t switch lights or appliances on or off. From outside, call 911 or National Grid’s gas emergency line, and don’t go back in until they say it’s safe. Call us once the utility has cleared the house.
A cracked heat exchanger can leak carbon monoxide into the house, which is why we inspect it on every furnace repair visit.
Quick Checks Before You Call
- Set the thermostat to heat and a few degrees above room temperature; replace its batteries
- Replace a dirty air filter
- Make sure the furnace service switch (it looks like a light switch) is on and the breaker hasn’t tripped
- Check that the furnace’s front panel is fully closed – a safety switch keeps it off if not
Repair or Replace?
Furnaces commonly last 15–20 years. A cracked heat exchanger means replacement; otherwise the $5,000 rule is a good first check. If it’s time, see furnace installation – and if you’re still on oil, oil-to-gas conversion.
Furnace Repair FAQ
Why does my furnace turn on and then shut off?
Common causes are a dirty flame sensor, a clogged filter tripping the high-limit switch, or a pressure switch problem. They’re usually straightforward repairs once diagnosed.
Is it safe to run my furnace if I smell burning?
A light dusty smell at the first cold snap is normal and should fade quickly. A persistent burning or electrical smell means shut the furnace off and call us. If you smell gas, leave the house and call 911 or National Grid from outside.
Do you offer 24/7 furnace repair?
Yes – we take no-heat calls 24/7, and same-day appointments are available.
How a Service Call Works
No call-center runaround and no surprise invoices. Here’s exactly what happens when you call us.
Call or text us
Reach us at (516) 930-5483 any time. Tell us what’s happening and we’ll give you a realistic arrival window.
We find the real problem
A licensed technician tests your system and shows you what is wrong – in plain English.
You approve the price
You get a clear, upfront price before any work starts. Nothing happens without your OK.
It gets done right
We complete the repair or installation, test everything and walk you through what we did.
No Heat? Call Now
Call or text (516) 930-5483 – same-day appointments and 24/7 emergency service. We’ll find the cause and give you the price before we fix it.