Winter is when your furnace works hardest, and it’s exactly when small issues tend to surface. Knowing the common problems helps you spot trouble early and avoid waking up to a cold house on a frosty Spokane morning. Here’s what tends to go wrong and why.
The Furnace Won’t Heat
If the furnace runs but the house stays cold, common causes include a thermostat set or wired wrong, a clogged filter choking airflow, or a pilot or ignition problem. Start with the thermostat and filter before assuming the worst.
Short Cycling
A furnace that turns on and off repeatedly may be overheating from a dirty filter, have a failing flame sensor, or be oversized for the home. Short cycling wastes fuel and wears out components, so it’s worth addressing.
Weak or Cold Airflow
Rooms that never warm up often point to a dirty filter, closed or blocked vents, or leaky ductwork losing heat before it reaches you.
Strange Noises
Banging on startup, squealing, or rattling usually signals a mechanical issue, from a loose belt to a blower problem. These rarely fix themselves.
A Furnace That Won’t Turn On
Check the thermostat batteries, the furnace switch, and your breaker first. If those are fine and it still won’t start, the ignition system or a safety control may be involved.
Short on Heat, Big on Bills
If your furnace is heating less while costing more, it’s straining against one of the problems above.
When to Call for Repair
Filters and thermostat batteries are easy DIY checks. Ignition issues, persistent noises, and repeated shutdowns are best handled by a technician before you lose heat entirely. See our furnace repair services or call (509) 891-5110.
