When your furnace stops working in the middle of a Seattle winter, you need a technician who finds the real problem fast. Same-day service across King, Pierce & Snohomish Counties.
Furnace Diagnostic
We diagnose the real problem.
We diagnose the real problem before recommending any repair.
The symptoms you notice are rarely the whole story. Here's what's usually going on inside.
Not sure what's wrong? Book a diagnostic — we'll tell you exactly what's happening.
Recognize any of these? Our technicians have seen them all — and fixed them all.
Complete loss of heat — usually a failed ignitor, tripped safety switch, or gas valve issue.
Clicks but no flame — a worn hot surface ignitor or faulty flame sensor is the most common cause.
Gas smell, burning odor, or musty scent — could indicate a gas leak, overheating, or dirty filter.
Delayed ignition causing a gas buildup, or expanding ductwork from pressure changes.
Turns on and off every few minutes — overheating, dirty filter, or a failing flame sensor.
Should be blue. A yellow flame means incomplete combustion — possible carbon monoxide risk.
Fan won't shut off — a stuck fan relay, thermostat wiring issue, or limit switch problem.
Gradual increase in heating costs often points to a dirty burner, failing heat exchanger, or poor airflow.
"Furnace died on the coldest night of the year. Called Next Phase first thing in the morning, tech was here by 11am. Bad ignitor — replaced it on the spot. Heat was back before lunch."
"Smelled something weird from the vents. Another company said we needed a new furnace. Next Phase found a cracked inducer motor and fixed it for way less. Honest guys."
"Our furnace was short cycling every few minutes. The tech cleaned the flame sensor and checked everything else while he was at it. Runs perfectly now. Fair price, no upselling."
"Upfront pricing before any work started. The tech explained exactly what was wrong with our blower motor and what it would cost. No games, no pressure. We'll use them again."
"Loud banging every time the furnace kicked on. Turned out to be delayed ignition from dirty burners. Quick clean and adjustment — been quiet ever since. Great technician."
"Furnace died on the coldest night of the year. Called Next Phase first thing in the morning, tech was here by 11am. Bad ignitor — replaced it on the spot. Heat was back before lunch."
"Smelled something weird from the vents. Another company said we needed a new furnace. Next Phase found a cracked inducer motor and fixed it for way less. Honest guys."
In most cases, same day. We serve King, Pierce, and Snohomish Counties and keep our trucks stocked with common furnace parts. If you call in the morning, we can usually be there by afternoon.
Yes. We service Carrier, Trane, Lennox, Goodman, Rheem, York, Bryant, and every other major brand — regardless of age or who installed it.
We'll tell you honestly after the diagnostic. If the repair cost is reasonable relative to the furnace's remaining lifespan, we recommend repair. If it's not worth fixing, we'll explain why — with no pressure either way.
Always. After diagnosing the issue, we provide exact pricing before any repair work begins. If you decline, you only pay the diagnostic fee. No surprises, no hidden charges.
All of our repairs are guaranteed. If the same issue returns within our warranty period, we come back and fix it at no additional cost. We also check whether your furnace is still under manufacturer warranty before any work begins.
Small furnace problems become expensive ones. Book a diagnostic today and get the real answer — with upfront pricing before any work begins.
Same-day service · All brands · Upfront pricing · Repair guaranteed