What Does the Blinking Light on My Furnace Mean?
A blinking furnace light is a control board fault code. How to read it safely, what common codes mean, and when to call 612-429-3465 instead of resetting.
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Central Minnesota Heating and Cooling repairs and replaces furnaces, ACs, heat pumps and boilers in Bloomington (Hennepin County), about 10 miles from downtown Minneapolis.
Bloomington has two housing eras: the grid of 1950s and early-60s ramblers on the east side, and the hillier west side near Hyland Lake Park Reserve and Normandale Lake that filled in later with split-levels, walkouts and two-stories.
Updated October 27, 2026 · By Eric Brown, owner, Central Minnesota Heating and Cooling

Around town: Mall of America · Hyland Lake Park Reserve · Normandale Lake · Minnesota Valley National Wildlife Refuge · Old Shakopee Road. Neighborhoods: East Bloomington · West Bloomington
Book in BloomingtonBloomington grew from about 9,900 people in 1950 to 50,500 in 1960, and that decade built most of the east side. Orrin Thompson was selling three-bedroom ramblers here by 1954, and the blocks around them followed the same plan: one story over a full basement, a gas furnace beside the chimney, ducts run through the joists and a return or two in the hall. Since then most have had basements finished, windows replaced and attics insulated, which changes the load the next furnace has to meet.
The west side filled in later on hillier ground, where longer duct runs and lower levels set partly into the slope are the pattern. Closer to the airport, some east-side houses got central air through the Metropolitan Airports Commission's noise mitigation program, which began in 1992 and paired air conditioning with new windows and insulation so the windows could stay shut.
Many east Bloomington ramblers are on their third furnace, but the chimney is usually original. When an 80% furnace is swapped for a 96% model vented in PVC, a gas water heater left alone in that big masonry flue can struggle to draft, and it's one of the most common winter surprises here. On the west side, split-levels and walkouts have the opposite trouble: a lower level that stays cold while the main-floor thermostat is satisfied.
Air conditioners installed through the airport noise program are reaching the end of their life, and many from the 1990s and 2000s still use R-22. Across the east side, condensers sit in narrow side yards between ramblers, where fences and shrubs choke airflow and the unit breathes its own hot exhaust. On the west side, upper floors of two-stories and split-levels take the afternoon sun while lower levels stay cool, a spread one thermostat can't manage well.
CenterPoint's heating rebates cover high-efficiency furnaces and boilers and let you choose your own dealer, and it pays toward a ducted heat pump when the heat pump is paired with a gas furnace. Xcel's heat pump and central AC rebates are handled through its Trade Partner Network, so ask whether the rebate needs a registered contractor. Xcel's AC Rewards and Saver's Switch programs trade bill savings for cycling your AC on peak days.
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 Bloomington and nearby towns in Hennepin County, about 10 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 Bloomington 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.
If it is low on refrigerant, that usually decides it. R-22 production ended in 2020, so a recharge uses reclaimed refrigerant that costs a lot, and the leak is still there. A new system runs on R-410A or a newer refrigerant like R-454B and needs a matching indoor coil. If the old unit only needs a capacitor or contactor, a repair can buy a season or two while you plan.
Usually not. Many ramblers from this era have had new windows, attic insulation and siding since they were built, so they lose less heat than the original nameplate assumed. We size replacements with a Manual J load calculation on the house as it stands today. An oversized furnace short-cycles, heats unevenly and wears out parts sooner, and an oversized air conditioner leaves the house clammy.
If it's still the original unit, probably soon. The Metropolitan Airports Commission's program started in 1992, so the earliest systems are more than 30 years old, and many use R-22, which is expensive to recharge. Replacement is up to you; the MAC's current phase covers only homes that qualify under its latest agreement. Check the condenser's rating plate for the refrigerant type and manufacture date before you decide.
Usually the trunk and branches are sound, but seventy years of changes add up. Panned joist returns leak, basement remodels cut or boxed in runs, and one or two returns sized for a 1950s blower can starve a modern one. A static pressure reading shows whether the returns are starved. If it's high, sealing joints or adding a return often costs less than a bigger blower and quiets the system too.
A blinking furnace light is a control board fault code. How to read it safely, what common codes mean, and when to call 612-429-3465 instead of resetting.
Read the guideBang, squeal, scrape, rattle, hum, click or whistle: what each furnace noise means, whether it's safe to run, and when to call 612-429-3465.
Read the guideCentral AC brands for Minnesota's short, humid summers: SEER2 payback, humidity control, coil matching, the R-454B and R-32 switch, and installed cost.
Read the guideBrands we service in Bloomington: Carrier · Trane · Lennox · Goodman · Rheem · Mitsubishi Electric · Daikin · American Standard · Navien · Weil-McLain · and every other major brand
Heat out in Bloomington? Call or send a request.