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Your CO Alarm Went Off

Your carbon monoxide alarm is sounding and you are trying to work out whether it is real. Treat it as real. Get everyone outside, then call 911 or your gas utility from outside the building. Do not wait to see if it stops. Once the fire department or the utility has cleared the house, call us and we will look at what caused it.

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By our service team · vetted by the techs who do this daily

The First Five Minutes, In Order

1. Get every person and pet outside to fresh air. Do not stop to gather things. 2. Leave the door open behind you if you can do it without delay. 3. From outside, call 911 or your gas utility's emergency line. Tell them your carbon monoxide alarm sounded. 4. Stay outside and stay together until responders tell you the building is safe to enter. 5. If anyone has a headache, nausea, dizziness, confusion or is unusually sleepy, say so on the call. Those are the symptoms that move this from a maintenance problem to a medical one. Responders will bring a meter and read the actual levels.

If You Smell Gas As Well

Same answer, faster. Leave the building immediately, then call 911 or the gas utility from outside. A gas smell and a sounding carbon monoxide alarm are two separate warnings that both point outdoors. Do not flip light switches, do not unplug anything, do not use a phone inside, and do not light a match to check anything. Do not go back in for a charger or a pet carrier. The utility will shut off supply at the meter if it needs to and will tell you when the building is clear. We come after that, once someone with a meter has said it is safe to be inside.

What Not To Do

Do not open a window and go back to bed. Airing out the room hides the reading without fixing the source. Do not pull the batteries out of the alarm to quiet it. Do not restart the heating system to see if the alarm goes off again, and do not tape over or cover the alarm. Do not open the furnace or heater cabinet, touch gas piping, or poke at a flue or vent connector yourself. Carbon monoxide is odourless, so your nose is not a test. And do not assume a chirp is the same as a full alarm. If you are unsure which sound you heard, treat it as an alarm and go outside.

When To Call Us

Call us once the fire department or the gas utility has been out and the building has been cleared. We service gas furnaces, heaters and heat pump systems for homeowners across Florida, and we will trace what set the alarm off. That usually means checking the heat exchanger for cracking, inspecting the flue and vent connector for corrosion or separation, confirming combustion air is getting in, and looking at whether a blocked filter or a failing blower has been forcing the system to run hard. Older properties near the coast get corrosion in vent piping. Newer tract homes get problems from long runtimes and tight construction. We look at both.

Keeping It From Happening Again

Carbon monoxide alarms belong on every level of the home and outside the sleeping areas, and they have an expiry date printed on the back. Most units are done at seven to ten years, so check yours and replace the ones past date. Test them monthly with the button. Beyond that, a heating system that gets looked at before the cold snap is the practical fix, because most of what we find at an annual visit is a vent joint working loose or corrosion starting at a connector. If you have never had the flue inspected on a system that came with the house, that is the call to make. Ask us for heating repair or a heater inspection and we will schedule it.

Your CO Alarm Went Off — common questions

Can a carbon monoxide alarm go off for no reason?

They can false alarm near end of life, and some react to other gases. But you cannot tell which from inside the house. Go outside, call 911 or the gas utility, and let someone with a meter make that call.

What is the difference between a chirp and an alarm?

A single chirp every minute usually means a low battery or an expired unit. A loud repeating pattern of four beeps is the carbon monoxide alarm. If you are not certain what you heard, leave the building and call.

My AC is running, so can it be carbon monoxide?

Cooling equipment does not burn fuel, so it is not a carbon monoxide source. The likely sources are a gas furnace or heater, a water heater, a fireplace or a running vehicle. Get out first, then have it checked.

How it works

  1. Step 1

    Tell us the symptom

    Call or fill in the quote form with what you hear, smell or feel. Warm air, ice on the lineset, a humming outdoor unit. That detail helps us load the right parts before we drive out.

  2. Step 2

    We diagnose on site

    We check the thermostat, the air handler, the condenser and the electrical side, then measure what the system is actually doing. You get a plain explanation of the fault and the repair options before we start.

  3. Step 3

    We repair and verify

    Once the repair is done we run the system and confirm temperature split, drainage and airflow at the vents. If a part is on order, we tell you the timeline instead of leaving you guessing.

Call (888) 878-4879
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Why homeowners call us

  • We plan for salt airCoastal humidity and salt eat coils, contactors and cabinet screws. We look for corrosion during every visit and treat it as part of the diagnosis, not an afterthought, so a repaired system does not fail again in the same spot.
  • Built for constant runtimeFlorida systems run most of the year, so bearings, capacitors and drain lines wear faster than the manual suggests. We size repairs around that reality and point out the components likely to be next in line.
  • Old houses and new onesIsland properties often hide ductwork in tight, damp spaces, while tract homes tend to have short, undersized returns. We have worked both and adjust the approach rather than forcing one standard fix.
  • Clear talk, no upsell theatreWe tell you what failed, what it takes to fix it, and whether repair or replacement makes more sense for the age of the equipment. If a repair will hold, we say so and get on with it.
  • All major brands, gas & electricIndependent service on Carrier, Trane, Lennox, Goodman, York and the rest.
  • Straight answersWhen a replacement beats a repair, we tell you, sometimes before we roll a truck.

About this guide

Applies toAll major brands
Safe checksYes
PricingWritten quote
Open7 days

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