Carrier Furnace Error Codes: What the Blinking Light Means
Carrier furnace error codes from the maker's own troubleshooting guides: how to count the flashes safely, what each code means, and when to call a tech.
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Central Minnesota Heating and Cooling repairs and replaces furnaces, ACs, heat pumps and boilers in Oak Park Heights (Washington County), about 23 miles from downtown Minneapolis.
Oak Park Heights was platted as Oak Park in 1857 beside Lake St. Croix, but it barely grew until construction started on the St. Croix Mall in 1960, so nearly all of its houses, apartments and senior housing are newer than that.
Updated October 27, 2026 · By Eric Brown, owner, Central Minnesota Heating and Cooling

Around town: St. Croix Crossing · Stillwater Overlook · Allen S. King Generating Station · Brekke Park · Minnesota Highway 36
Book in Oak Park HeightsOak Park began with a ten-block plat in 1857. By the 1880s a sawmill and a barrel maker worked its riverfront, and well-off families built houses on the bluff above Lake St. Croix, yet only a few hundred people lived there in 1910, and little was built in the 1920s and 1930s. Highway 36 cut the community in two during the 1930s. In the late 1990s, part of the original townsite, including many of the mid-1800s bluff homes, was cleared for the new river bridge, which removed much of the city's oldest housing.
Most of today's city came after 1960, when construction of the St. Croix Mall set off commercial growth along Highway 36. Between the 1970 and 1990 censuses the population went from 1,238 to 3,486, and later development spread south of the highway past Highway 5, with apartments and senior housing mixed in. So most furnaces here are replacements in houses from the 1960s through the 1990s, often with central air that was fitted later to ductwork laid out for heating, while the housing added since 2000 is nearing its first round of equipment replacement.
Many Oak Park Heights households are older, and about a third are someone 65 or older living alone, so a furnace that quits on a subzero night matters more than usual. We give no-heat calls priority, but a fall tune-up is the better protection, since it turns up a cracked igniter, a coated flame sensor or a noisy inducer while the weather is still mild. Test the CO alarms too, including the ones outside the bedrooms. Apartment renters should tell the building manager at the first sign of trouble.
July in the St. Croix valley is humid, and an oversized AC in an Oak Park Heights house cools quickly without drying the air, leaving rooms clammy. In an apartment or senior building where each unit has its own air handler, a clogged condensate line can leak into the unit below, so a float switch and a yearly drain cleaning matter. Heat waves are hardest on older residents, so test the AC in May instead of waiting for the first 90-degree day.
Oak Park Heights is Xcel Energy territory for both gas and electricity. Homeowners replacing a furnace can check Xcel's Heating Equipment Rebates, which point to participating contractors, and on the cooling side, Xcel offers Residential Cooling Rebates plus the Saver's Switch cycling program. Xcel's heat pump rebates can require a registered contractor, so ask whether yours does before choosing a heat pump. Renters should check with the landlord first, since the equipment usually isn't theirs to replace.
Rebate programs change every year; check the utility's current terms before you buy. Our guides: Xcel and CenterPoint rebates, heat pump rebates, what happened to the federal credits.
Central Minnesota Heating and Cooling, owned by Eric Brown and in business since 2009, serves Oak Park Heights and nearby towns in Washington County, about 23 miles from downtown Minneapolis. We're open 7 days, 7am–9pm, and no-heat calls get priority. Call 612-429-3465.
An HVAC service call in Oak Park Heights is a flat $79 trip charge, waived when you approve the repair. You get a written price before any work. Installed prices are on our pricing page.
Usually, with some adjustments. Ducts from that era were often sized for heat first, and the return side is the common weak spot once central air and a variable-speed blower are involved. Static pressure gets measured at the quote visit. If it's high, the fix is often a larger filter grille or an added return rather than new ducts, and that work goes into the written price so nothing surprises you later.
Yes. Our light-commercial work covers rooftop units, commercial furnaces and mini-splits in multifamily buildings, alongside the houses. For apartments, we work through the owner or property manager, who approves the repair and the written price. If you rent a unit and the heat or cooling fails, call your manager first; the equipment belongs to the building, and they'll arrange the service.
Book a furnace tune-up in early fall; ours start at $129 and include a carbon monoxide reading. Check that a carbon monoxide alarm works near the bedroom (state law requires one within 10 feet of each sleeping room), and choose a thermostat your parent finds easy to read. Put our number, 612-429-3465, by the phone. We're open 7 days, 7am–9pm, and a house with no heat moves to the top of our list.
Most can. With forced-air heat already in place, the job is an evaporator coil above the furnace, an outdoor condenser and the copper lines between them. The questions are whether the ducts and returns can carry cooling airflow and whether the upstairs or far rooms get enough supply. We measure first. Where the ducts fall short, a ductless system for part of the house can cover what they can't.
Carrier furnace error codes from the maker's own troubleshooting guides: how to count the flashes safely, what each code means, and when to call a tech.
Read the guideSteam, a whoosh and a stopped fan usually mean a normal heat pump defrost.
Read the guideReplacing central air in River Falls, WI: Manual J sizing, heat pump and ductless options, RFMU and Focus on Energy programs, and $5,200–$9,800 installed.
Read the guideBrands we service in Oak Park Heights: Carrier · Trane · Lennox · Goodman · Rheem · Mitsubishi Electric · Daikin · American Standard · Navien · Weil-McLain · and every other major brand
Heat out in Oak Park Heights? Call or send a request.