Furnace blowing cold, cycling on and off, or not starting at all? Confluence Heating & Air repairs gas furnaces across Dayton and the Miami Valley. Call the local line and describe what it is doing.
Tell us what the Dayton property is doing and we'll take a look.
About 68 percent of occupied homes in the city of Dayton heat with utility gas, and the figure across Montgomery County is about 63 percent, per the 2020-2024 American Community Survey. Add a heating season that runs about 5,645 degree days a year, and gas furnace repair is the single most common call in this region. The equipment is mostly forced-air, mostly in basements, and mostly attached to ductwork that is older than the furnace.
The failures follow the calendar. Early-season calls in October and November are igniters and flame sensors that were marginal last spring, plus systems that will not start because a switch was bumped or a condensate line dried and cracked. Deep-winter calls in January, when the airport normal low is about 20 degrees and the month accounts for roughly a fifth of the year's heating load, are the wear-out failures: inducer motors, blower motors, pressure switches, and heat exchangers that have finally cracked after twenty winters of expanding and contracting.
A modern gas furnace runs a fixed sequence: thermostat call, inducer motor starts, pressure switch proves draft, igniter glows, gas valve opens, flame sensor proves flame, blower starts after a delay. When something fails, the control board stops the sequence at that step and usually flashes a code. The technician watches the sequence, reads the code, and then confirms it with a meter rather than trusting the board alone, because a pressure switch fault can be a bad switch, a blocked flue, a cracked inducer housing or a plugged condensate trap.
Cold-air complaints get the same treatment. A furnace that lights, runs a few minutes and shuts down on high limit is almost always an airflow problem: a packed filter, a blower on the wrong tap, closed registers or ductwork too small for the furnace that was put on it. The high-limit trips are protecting the heat exchanger. Replacing the limit switch and walking away would remove the protection and leave the cause in place.
Every gas furnace visit includes a heat exchanger and combustion check. That means inspecting the exchanger for cracks, checking flue draft and venting, and taking a combustion reading. A cracked heat exchanger is the one furnace fault that gets the unit shut off, and you will be shown why before the conversation moves to replacement.
Igniters and flame sensors are the small, frequent repairs. A hot-surface igniter is a brittle ceramic element that eventually cracks; a flame sensor gets coated with oxide and stops seeing the flame, so the furnace lights and shuts off within seconds. Both are truck-stock parts and both are quick.
Inducer motors and pressure switches are the mid-range repairs. The inducer pulls combustion air through the exchanger and out the flue; when its bearings go it whines and eventually stops, and the pressure switch will not close. Blower motors and their capacitors are the same tier: a blower that hums and does not spin is often a capacitor, but a motor drawing high amps because it has been fighting a restrictive duct system for years is a motor, and the duct problem gets flagged.
Control boards, gas valves and heat exchangers are the large repairs. Boards fail from moisture and voltage spikes; gas valves fail from age; heat exchangers crack from thermal stress and are the point where a furnace's age decides whether repair is sensible. On a unit under twelve years old, a board or valve is worth replacing. On a unit past twenty, the exchanger is the end of the road.
A furnace that keeps needing the same repair usually has a house problem, not a furnace problem. Dayton's median home dates to around 1951, and a lot of those houses have ductwork sized for a smaller, slower gravity or early forced-air furnace. When a higher-capacity unit was installed later, often without adding return air, the result is high static pressure: the blower works too hard, the exchanger runs too hot, and the limit switch trips. That is the mechanism behind a lot of the 'third blower motor in ten years' stories.
When the measurements show that pattern, you will hear about it. Adding a return, opening up a restrictive filter rack or correcting a blower speed is often the repair that actually stops the repeat visits.
Questions
Get everyone out of the house and call 911 or the gas utility's emergency line from outside. Do not go back in to reset the alarm. Once the house has been cleared, the furnace, water heater and venting need to be inspected before either appliance runs again.
Sometimes. It can be a blower on the wrong speed, a closed or disconnected duct, or a zone damper stuck shut. In older Dayton houses it is often duct design: long runs with no return in the far rooms. The visit will tell you which, and whether a repair, a duct correction or a supplemental system like a ductless head is the sensible fix.
There is no hard cutoff, but past about fifteen to twenty years the odds of a second major failure shortly after the first go up, and the heat exchanger is closer to the end of its life. On a unit that age with a large repair, you get the replacement number alongside the repair number and the reasoning for both.
No. This work covers forced-air gas furnaces, electric furnaces and air handlers, and the heat pumps and air conditioners attached to them.
Call the local line or send the form, and we will get back to you to set up a visit.
Request a free estimate Call (937) 719-5148