No Heat in Airway Heights, WA

Airway Heights has seen significant residential growth over the past 15–20 years. A lot of that housing stock was built with builder-grade HVAC equipment - functional at the time, but now hitting the end of its designed lifespan. That context matters, because the failures we see most often aren't random. They're predictable wear patterns on aging systems.

Here are the most common root causes of a furnace that runs but won't heat:

1. Failed Igniter The igniter (hot surface or spark type) is what lights the burners. When it fails, the gas valve opens, gas flows briefly, but nothing ignites. The furnace detects the failed ignition, shuts the gas off as a safety measure, and you get cold air. Igniters are consumable parts - they wear out, especially on systems 10–15 years old.

2. Faulty Gas Valve The gas valve controls fuel delivery to the burners. A valve that's stuck closed, failing electrically, or receiving incorrect voltage won't open - meaning no flame, no heat. This is a more involved repair but a clear, diagnosable failure.

3. Tripped or Failed Pressure Switch Pressure switches confirm that the inducer motor (the fan that vents combustion gases) is working before allowing ignition. A failed inducer motor, a cracked rubber hose, or a faulty switch itself can all cause the pressure switch to stay open - locking the furnace out of its ignition sequence entirely.

4. Cracked Heat Exchanger This is the most serious cause on this list. The heat exchanger is a metal chamber that transfers heat from combustion into your air supply - without mixing combustion gases into that air. When it cracks (common in older, high-cycle systems), the furnace's safety controls may shut down heating to prevent CO exposure. This is not a repair to defer.

5. Flame Sensor Failure The flame sensor is a small rod that confirms the burners actually lit. When it gets coated with oxidation (which happens over time), it can't "see" the flame - so the furnace shuts the gas off within seconds of ignition as a precaution. You get a brief burst of warm air, then cold air again.

6. Overheating and Limit Switch Lockout If airflow is restricted - by a clogged filter, blocked vents, or a failing blower motor - the furnace overheats. A safety device called the high-limit switch cuts the burners to prevent damage. The blower keeps running to cool things down, which is why you feel air but no heat. Repeated limit trips cause long-term heat exchanger damage.

7. Control Board Failure The control board is the brain of the furnace. It sequences every component in the right order. When it fails - due to age, power surge, or component fatigue - it can disrupt any part of the heating cycle, often in ways that look like multiple problems at once.

Before you call, run through these checks. Some no-heat calls have simple fixes a homeowner can handle in five minutes.

• Check your thermostat. Make sure it's set to HEAT (not COOL or FAN ONLY) and 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 the filter. A severely clogged filter can cause the furnace to overheat and lock out. Pull the filter and hold it up to light - if you can't see through it, replace it before running the system again.
• Check the circuit breaker. Find the breaker labeled for the furnace or air handler and confirm it hasn't tripped. Reset it once if it has. If it trips again, stop and call.
• Check the furnace power switch. There's usually a standard light-switch style power switch on or near the furnace. Confirm it's in the ON position.
• Check the gas supply. If you have other gas appliances (stove, water heater), confirm they're working. If nothing gas-powered is working, contact your gas utility.
• Look for an error code. Many furnaces have a small LED that blinks a fault code. Count the blinks and check the legend on the inside of the furnace door panel.

> If you smell rotten eggs or sulfur at any point, stop. Leave the home immediately. Do not operate any switches or open flames. Contact your gas utility's emergency line,