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.
Read the guide
Furnace repair in Oak Grove starts with a $79 trip charge, waived when you approve it, on large lots near Lake George and the Rum River. Lots beyond CenterPoint's gas mains run propane, and Lake George furnaces often sit in hard-to-reach crawlspaces and closets.
Oak Grove furnaces range from 1970s and 80s basement units, long since replaced once or twice, to condensing models in newer two-stories, and they fail where furnaces usually fail: the igniter, the flame sensor, the inducer, the pressure switch, the control board. On lots beyond CenterPoint Energy's mains the furnace burns propane, so the tank level and the regulator are worth ruling out before a part is blamed.
Lake George houses add access problems. A furnace in a crawlspace or closet is easy to forget, filters go unchanged, and a starved blower trips the high limit until the heat exchanger is at risk. Condensing furnaces in unheated spaces can freeze their condensate drains. Wooded lots bring one more fall surprise: nests and leaves in the PVC vent, which the first cold night turns into a lockout.
Updated November 10, 2026
National averages (HomeGuide, 2026), not our prices: an igniter $100–$250, a flame sensor $80–$250, a pressure switch $150–$400. More in the furnace repair cost guide.
Symptom guides: Blowing cold air · Won't ignite · Short cycling · Blinking light codes · Signs your furnace needs a technician
Quite possibly. Over the summer, wasps, birds and mice nest in PVC intake and exhaust pipes, and leaves collect at the terminations. The inducer can't pull enough draft, the pressure switch stays open, and after a few failed tries the control locks the furnace out. Look at the pipes outside for debris, but don't reach in. A technician can clear the vent, read the pressure switch and, where the manufacturer allows, add screens.
Possibly. Furnaces in houses from that era were often sized generously, and later windows and insulation widened the gap. But short cycling also comes from a dirty flame sensor, a clogged filter tripping the limit, or a thermostat mounted near a supply register. We rule those out first. If the furnace really is oversized, a properly sized replacement is the long-term fix, and we'll show you the Manual J numbers.
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 guideMost furnace replacements take one day; venting, a chimney liner, gas line or duct work can add a second. Ours run $4,500–$9,500 installed. Call 612-429-3465.
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 guideHeat out? AC quit? Call or send a request.