Furnace Repair in Rolla, MO
Furnaces here run from October through April. If yours quits, tell us what it's doing and a licensed contractor who covers Phelps County will get in touch.
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Seven months of work, and a grid that doesn't always hold up
Your furnace runs from October through April here, close to seven months of the year. On the nights it works hardest, the average low is 25°F, and it cycles on and off for hours to hold the house steady. Every one of those cycles asks the igniter to light the burner again. Igniters wear down with use, and a weak one will stop lighting it at all.
Storms here have knocked power out before. Ten winter storms and 56 damaging wind events have hit this area over the past ten years, and 19% of Missouri households lost power for 24 hours or more in 2024. Most furnaces restart on their own once power comes back. If yours does not, that points to a problem worth calling in, not waiting out.
- 7 months
- October through April, your furnace is on duty
- 25°F
- the average winter night it heats against
- 10 winter storms
- in ten years, the nights a failure hurts most
NOAA nClimDiv, 1991–2020 normals
- Why won't my furnace turn on?
- Most often it's the thermostat, the power supply, or the furnace not getting a signal to start. Check that the thermostat is set to heat and above room temperature, and that the furnace switch and breaker are both on. If those are fine, the igniter or flame sensor may have failed, or a safety switch is stopping the furnace from starting at all. A contractor can test each part and tell you which one is the problem.
- Why is my furnace blowing cold air?
- The furnace is likely running the blower without the burners lit. That happens when the igniter fails, the flame sensor is dirty, or the gas valve isn't opening, so the furnace tries to heat but never actually fires. It can also mean the thermostat fan is set to "on" instead of "auto", which pushes air through the vents even when the burners are off. A contractor can check the igniter, sensor, and gas valve to find which one is keeping the burners from lighting.
- Why won't my furnace pilot light stay lit?
- This usually means the thermocouple has worn out and can no longer hold the gas valve open once you let go of it. A draft blowing across the pilot, a dirty pilot opening, or a failing gas valve can also cause it. Since this involves the gas line, it's worth having a contractor look at it rather than repeatedly relighting it yourself.