If your furnace is running but your home in Mead or Spokane is still cold, the problem is often something simple: a thermostat setting, a tripped breaker, or a clogged air filter. Before you call for furnace repair, run through these nine safe checks. They take about fifteen minutes, need no tools beyond a flashlight, and they will help you describe the problem accurately if you do need a technician. If you smell gas, hear a loud boom, or your carbon monoxide alarm is sounding, skip the checks: leave the house and call your gas utility or emergency services from outside.
Why Is My Furnace Not Heating?
A furnace that runs without heating your home usually has an airflow, fuel, power, or control problem. The blower may be moving air, but if the burners never fire, the air stays cold. If the burners fire but airflow is blocked, the furnace can overheat and shut itself off before the house warms up. The nine checks below work through the most common causes in order, from the simplest to the ones that need a professional.
9 Checks to Try Before You Call a Technician
1. Check the Thermostat Settings
Make sure the thermostat is set to Heat, the setpoint is above the current room temperature, and the fan is set to Auto rather than On. If the display is blank, replace the batteries. A thermostat set to Cool, or a setpoint below room temperature, is the most common reason a furnace never starts a heating cycle.
2. Check the Power
Check that the furnace switch (usually a standard light switch near the unit) is on, and check the breaker panel for a tripped furnace breaker. Reset a tripped breaker once. If it trips again immediately, stop and call a technician: repeated trips can point to an electrical fault.
3. Check the Air Filter
A dirty filter restricts airflow, which can cause the furnace to overheat and shut off on its high-limit switch. Hold the filter up to a light: if you cannot see light through it, replace it. During heating season, check the filter every month.
4. Open the Vents and Registers
Walk through the house and make sure supply registers are open and not blocked by furniture, rugs, or curtains. Also check that return-air grilles are clear. Closing too many vents does not save energy: it raises pressure in the ductwork and can trip the furnace’s safety controls.
5. Check the Pilot Light or Ignition
Older furnaces have a standing pilot light; newer ones use hot-surface or electronic ignition. If the pilot is out, follow only the relighting instructions printed on the furnace itself. If you smell gas, are unsure which type of ignition you have, or the pilot will not stay lit, do not keep trying: call a professional.
6. Check the Gas Supply
Make sure the gas valve near the furnace is open (the handle runs in line with the pipe when open). If other gas appliances in the home are also out, the supply may be interrupted: contact your gas utility. If you smell rotten eggs at any point, leave the house at once, do not touch light switches or phones inside, and call the utility or emergency services from outside.
7. Check the Condensate Drain (High-Efficiency Furnaces)
High-efficiency condensing furnaces drain water as they run. If the condensate line is blocked, the furnace may shut down to protect itself. Look for standing water around the furnace base or a full condensate trap, and note it for the technician. Do not dismantle the drain or the furnace cabinet.
8. Clear the Outdoor Vent Pipes
High-efficiency furnaces vent through PVC pipes on an outside wall. Snow, ice, leaves, or nests blocking those pipes can shut the furnace down. Clear obstructions gently from outside. Never cover or cap a vent, and never run the furnace with a vent disconnected.
9. Note the Error Code and Reset Once
Many furnaces show a blinking error code through a small sight glass on the cabinet door. Write down the blink pattern before you reset: it tells the technician exactly what the furnace detected. Reset once by turning the thermostat off for thirty seconds and back to Heat. If the furnace locks out again, it needs a professional diagnosis.
When to Stop and Call a Professional
Stop checking and call a professional if you smell gas, your carbon monoxide alarm sounds, the breaker trips repeatedly, you smell burning or see scorch marks, water is pooling around the furnace, or the furnace keeps shutting down after a reset. If the house has no heat during freezing weather and anyone at home is elderly, very young, or has a medical condition, treat it as urgent and call for 24/7 emergency service.
Furnace Not Heating in Mead and Spokane Winters
Cold snaps in the Mead and Spokane area expose weak airflow and missed maintenance fast: a filter that was fine in mild weather becomes the blockage that trips the furnace on the coldest night. An annual tune-up before heating season catches dirty burners, weak ignition, and airflow problems while they are still small. PNW Heating and Air provides furnace service in Mead, WA, including repair and maintenance visits for gas and electric systems.
How PNW Heating and Air Can Help
If the checks above do not restore heat, PNW Heating and Air can diagnose the problem on a furnace repair visit, from thermostats and ignition systems to blowers and safety controls. Our heating services cover repair, replacement, and maintenance across the Spokane area, with 24/7 emergency service when the heat goes out. Call (509) 408-3379 or request a free estimate through our contact page.
Frequently Asked Questions About a Furnace Not Heating
Why is my furnace running but not heating my house?
Usually airflow, fuel, power, or a control is stopping the heating cycle: a wrong thermostat setting, a dirty filter, a tripped breaker, a blocked vent, or a failed ignition. Work through the nine checks above, and note any error code before you call.
Can a dirty air filter stop a furnace from heating?
Yes. A clogged filter restricts airflow, the furnace overheats, and its high-limit safety switch shuts the burners off. Replacing the filter fixes it when the filter is the cause.
How do I know if the thermostat is the problem?
If the display is blank, the setting is on Cool, or the setpoint is below room temperature, the thermostat is the likely cause. Replace the batteries, set it to Heat with the fan on Auto, and set the temperature a few degrees above the room temperature. If the furnace still does not respond, the thermostat wiring or the furnace controls need testing.
Is it safe to relight my furnace pilot light myself?
Only if your furnace has a standing pilot and you follow the manufacturer’s instructions printed on the unit. If you smell gas, cannot identify the ignition type, or the pilot will not stay lit, stop and call a professional.
When should I call for emergency furnace repair?
Call immediately if there is no heat during freezing weather, you smell gas, the carbon monoxide alarm sounds, or the furnace repeatedly shuts down after a reset. PNW Heating and Air offers 24/7 emergency service: call (509) 408-3379.
Most no-heat calls start with one of the nine checks above. If yours needs a technician, PNW Heating and Air is a call away: request a free estimate through our contact page, or explore our heating services and furnace service in Mead, WA.