No Heat in Spokane, WA

Here's the reality: a furnace blowing cold air is your system telling you something has already failed. It's not a warning sign - it's a failure sign.

The longer you run a furnace in a fault state, the more stress you put on the components that are still working. A heat exchanger that's cracked and undetected, a gas valve that's cycling incorrectly, or a control board sending bad signals - these don't fix themselves. They compound.

The three risks that matter most:

• Pipe freeze. Spokane homes - especially older craftsman-era houses in Browne's Addition and newer builds on the edges of town - can see interior pipe temps drop fast when the heat is gone for 12–24 hours. Burst pipes cost far more than a furnace repair.
• Carbon monoxide exposure. A cracked heat exchanger can allow combustion gases - including CO - to enter your living space. You won't smell it. You won't see it. If anyone in your home has unexplained headaches, nausea, or dizziness, get everyone outside immediately and call 911 or your gas utility before calling us.
• Cascading component failure. When one part fails and the system keeps trying to run, secondary components - blower motors, draft inducers, ignitors - take on extra load. What starts as a $300 repair can become a $900 repair if you wait.

If you smell rotten eggs or sulfur at any point, leave the home immediately. Do not flip light switches. Contact your gas utility or 911 from outside, then call us.

A furnace that won't produce heat has a specific failure point somewhere in a chain of events. Understanding that chain helps you understand why a thorough diagnosis matters.

Here's how a furnace is supposed to work: The thermostat calls for heat → the control board signals the draft inducer motor to start → a pressure switch confirms airflow → the ignitor heats up → the gas valve opens → burners light → the heat exchanger warms up → the blower motor pushes air across the heat exchanger and into your home.

If any single step in that sequence fails, the system shuts down or runs without producing heat. Here are the most common failure points:

Ignitor failure. The hot surface ignitor is a fragile component that glows to light the burners. It degrades over time and eventually cracks or burns out. When it fails, the gas valve won't open - no ignition, no heat. This is one of the most common causes we see.

Gas valve failure. The gas valve controls fuel flow to the burners. A valve that's stuck closed, failing electrically, or receiving incorrect signals from the control board means no gas reaches the burners - even if everything else is working.

Pressure switch failure. The pressure switch is a small safety device that confirms the draft inducer is moving air correctly before allowing ignition. A failed switch, a cracked rubber hose connected to it, or a blocked condensate drain can all cause the switch to stay open - locking the system out of the ignition sequence entirely.

Limit switch lockout. The high-limit switch is a safety device that shuts the burners off if the heat exchanger gets too hot. A dirty filter, a blocked vent, or a failing blower motor can cause the system to overheat repeatedly - tripping the limit switch and eventually locking the furnace out of heating mode.

Control board failure. The control board is the brain of the furnace. It sequences every step of the ignition and heating cycle. A board that's failing can produce erratic behavior - sometimes heating, sometimes not, or running the blower without ever opening the gas valve.

A note on Spokane's housing stock: A significant number of homes built during Spokane's building booms 15 to 20 years ago are now running builder-grade furnaces that are at or past their expected service life. These units weren't designed for decades of use - they were designed to be affordable at the time of construction. If your home falls in that window, a no-heat call may be the beginning of a larger conversation about system age and reliability.

Before you call, run through these checks. Some no-heat calls have simple fixes you can handle yourself.

• Check your thermostat. Make sure it's set to HEAT (not COOL or FAN only), and that the setpoint is at least 3–5 degrees above the current room temperature. Replace the batteries if it's been more than a year.
• Check your filter. A severely clogged filter can cause the system to overheat and trip the limit switch. Pull the filter and hold it up to a light. If you can't see light through it, replace it before calling.
• Check your circuit breaker. Furnaces have a dedicated breaker. If it's tripped, reset it once. If it trips again immediately, stop - that's an electrical fault that needs a technician.
• Check the furnace power switch. There's usually a standard light-switch-style switch on or near the furnace. It gets bumped off accidentally more often than you'd think.
• Check your vents. Make sure supply and return vents throughout the house are open and unobstructed. Closed vents restrict airflow and can cause limit switch trips.

If you've checked all of these and the furnace still won't heat, it's time to call.