Furnace Repair in Federal Way, WA
Furnace repair for gas, electric, and oil heating systems.
Don't freeze this winter. Our Federal Way furnace repair technicians service gas, electric, and oil furnaces. We fix igniter failures, blower motor issues, thermostat problems, and heat exchanger malfunctions to keep your home warm and safe.
Furnace repair calls in Federal Way tend to cluster during the first cold snaps of fall and the coldest stretches of winter, when a system that's been idle for months is finally asked to run continuously. Gas furnaces depend on a functioning igniter or pilot, a properly firing burner assembly, a working inducer motor, and a blower to move heated air — and a failure in any one of these stops the whole heating cycle. We diagnose using the furnace's own diagnostic flash codes where available, rather than guessing at the failure point.
Because furnaces here often run in shoulder seasons with humid outdoor air, condensation-related issues on high-efficiency condensing furnaces are common, including clogged condensate drains and trap freezing during cold snaps. We check the condensate system as a routine part of diagnosing intermittent lockouts, not just the burner and igniter.
Why Choose Us for Furnace Repair in Federal Way?
- Same-day service — call before noon for a same-day appointment
- 90-day warranty on all parts and labor
- Upfront pricing — no hidden fees or surprise charges
- Factory-certified technicians trained on 75+ brands
- Fully stocked trucks for first-visit fixes
- Licensed, bonded, and insured for your protection
Common Furnace Problems We Diagnose
These are the failures our Federal Way technicians see most often, what usually causes them, and how they are normally fixed.
| Symptom | Likely cause | Typical fix |
|---|---|---|
| Furnace won't ignite | Failed igniter, flame sensor not detecting flame, or gas valve fault | Test igniter resistance and flame sensor microamp signal, replacing whichever fails specification |
| Furnace short-cycles | Dirty flame sensor, restricted airflow from a dirty filter, or overheating from a blocked vent | Clean the flame sensor, replace the filter, and inspect venting for blockage |
| Blower runs constantly | Fan limit switch stuck or blower relay failure on the control board | Test the limit switch and relay and replace the failed component |
| No heat but blower runs | Ignition failure, gas valve not opening, or a tripped high-limit switch | Diagnose the ignition sequence step by step using the control board's flash codes |
| Condensate leaking near a high-efficiency furnace | Clogged condensate drain line or a cracked condensate trap | Clear the drain line and inspect the trap for cracks, replacing if needed |
| Loud bang on startup | Delayed ignition causing gas buildup before lighting, often from a dirty burner or weak igniter | Clean burners and test igniter timing to restore proper ignition sequence |
| Furnace locks out and won't restart | Repeated ignition failures triggering a safety lockout after several attempts | Diagnose the underlying ignition fault using stored flash codes, then reset after repair |
Furnace won't ignite
Likely cause: Failed igniter, flame sensor not detecting flame, or gas valve fault
Typical fix: Test igniter resistance and flame sensor microamp signal, replacing whichever fails specification
Furnace short-cycles
Likely cause: Dirty flame sensor, restricted airflow from a dirty filter, or overheating from a blocked vent
Typical fix: Clean the flame sensor, replace the filter, and inspect venting for blockage
Blower runs constantly
Likely cause: Fan limit switch stuck or blower relay failure on the control board
Typical fix: Test the limit switch and relay and replace the failed component
No heat but blower runs
Likely cause: Ignition failure, gas valve not opening, or a tripped high-limit switch
Typical fix: Diagnose the ignition sequence step by step using the control board's flash codes
Condensate leaking near a high-efficiency furnace
Likely cause: Clogged condensate drain line or a cracked condensate trap
Typical fix: Clear the drain line and inspect the trap for cracks, replacing if needed
Loud bang on startup
Likely cause: Delayed ignition causing gas buildup before lighting, often from a dirty burner or weak igniter
Typical fix: Clean burners and test igniter timing to restore proper ignition sequence
Furnace locks out and won't restart
Likely cause: Repeated ignition failures triggering a safety lockout after several attempts
Typical fix: Diagnose the underlying ignition fault using stored flash codes, then reset after repair
What Happens During Your Furnace Repair Visit
- 1
Read diagnostic flash codes
Check the control board's LED flash sequence to identify the specific fault the furnace has logged before starting manual testing.
- 2
Inspect ignition components
Test the igniter's resistance and the flame sensor's microamp signal, since these two components are behind the majority of no-heat calls.
- 3
Check pressure switch and venting
Verify the inducer motor and pressure switch are functioning and that venting is clear, since blockages commonly trigger safety lockouts.
- 4
Verify airflow and condensate drainage
Confirm the filter and blower are providing adequate airflow, and check the condensate drain and trap on high-efficiency units for clogs or freezing.
Furnace Error Codes Explained
Codes vary by brand and model, but these are the fault families we run into most. Note the code before you call — it speeds up diagnosis.
2 flashes
Pressure switch stuck closed — often a common code across many gas furnace brands
3 flashes
Pressure switch stuck open, frequently from a blocked vent or failed inducer motor
4 flashes
Open high-limit switch, indicating overheating often tied to restricted airflow
5 flashes
No flame sensed within the trial period, pointing to igniter or flame sensor issues
7 flashes
Flame sensed when it shouldn't be, sometimes from a stuck-open gas valve
Repair or Replace? Honest Guidance
- Igniter, flame sensor, and pressure switch replacements are inexpensive relative to the furnace and worth doing regardless of system age.
- A cracked heat exchanger is a safety issue and typically means replacement rather than repair, since it can allow combustion gases into the airflow.
- Furnaces over 15-20 years old with a major component failure, like the inducer motor or control board, are often better replaced given efficiency gains in newer systems.
- If repair costs are approaching a significant fraction of replacement cost on an older unit, replacement is usually the more sensible long-term choice.
Furnace Maintenance Tips for Federal Way Homes
- Replace furnace filters every 1-3 months during heating season to maintain airflow and prevent overheating lockouts.
- Have the flame sensor cleaned annually, since a light coating of oxidation is a very common cause of short-cycling.
- Check condensate drain lines before winter on high-efficiency furnaces, since clogs are more common with the intermittent, damp-weather startups typical here.
- Keep vent terminations clear of debris, snow, or vegetation to prevent pressure switch faults.
- Schedule an inspection before the first cold snap each fall, since furnaces that sat idle all summer are more likely to reveal ignition problems on the first real heating demand.
Brands We Service for Furnace Repair
Our Federal Way furnace repair technicians are factory-certified to work on all major brands including Gibson, Tappan, White-Westinghouse, Kelvinator, Caloric, Café, GE Profile, Sharp, and more.
Other Appliance Repair Services in Federal Way
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Furnace Repair FAQs — Federal Way, WA
Most furnace control boards use LED flash codes to indicate a specific fault, such as a pressure switch or ignition issue; the exact meaning varies by brand, so we reference the furnace's own code chart during diagnosis.
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