Gas Furnace Repair in Portland & Vancouver

Quick answer

Furnace repair means finding why your gas furnace won't heat, and fixing that part instead of guessing. Common causes are a dirty flame sensor, a failed igniter, a clogged filter, a blower problem, or a tripped safety switch. A technician tests each one, explains what failed, and gives you the price before any work starts.

Key facts

Equipment	Gas furnaces in homes
Service area	Portland, OR and Vancouver, WA
Approach	Repair first. We tell you straight when it can't be fixed.
Repair price	You get it before any work starts
Diagnostic fee	Ask us when you call
Smell gas?	Leave first. From outside, call 911 and NW Natural at 800-882-3377.

What are the signs your furnace needs repair?

Your furnace needs a look when the house won't reach the temperature on the thermostat, or when the furnace acts differently than it used to. Small changes are worth noticing. They often point to one part that is starting to fail.

Write down what you see and when it happens. “Blows cold air after five minutes” tells a technician far more than “it's broken.”

Air from the vents is cool or lukewarm while the heat is on
The furnace starts, runs a few minutes, then shuts off
It clicks or hums but never lights
The blower won't come on, or won't shut off
New sounds: banging at start-up, squealing, or rattling
A burning smell that doesn't fade after the first run of the season
One or two rooms stay much colder than the rest

What can you safely check before you call?

You can safely check six things before you call. None of them need tools, and they fix a no-heat problem more often than people expect.

If none of these helps, leave the rest for a technician. Don't remove panels beyond the filter door, and don't try to relight or adjust any gas parts.

1Set the thermostat to Heat and a few degrees above room temperature. Replace its batteries if the screen is blank or dim.
2Check the furnace filter. If it's gray and clogged, put in a clean one of the same size.
3Find the furnace breaker in your electrical panel. If it's tripped, reset it once. If it trips again, stop and call.
4Look for the power switch on or near the furnace. It often looks like a light switch. Make sure it's on.
5Make sure the front panel is pushed in firmly. Many furnaces have a door switch that keeps them off when the panel is loose.
6Open the supply vents and move anything blocking the return grilles.

Not sure what's wrong yet?

Start with the safe checks. Many problems are a setting, a breaker, or a filter.

Find your symptom Compare repair vs. replace

Repair first: we fix what can be fixed
You approve the price before work starts
Sources listed for outside facts

What a visit includes

A technician's diagnosis to find the root cause
A plain explanation of what's wrong and what it takes to fix it
A straight answer if replacing makes more sense, and why
The price before any work starts
Your decision: no work starts until you say yes
Testing the furnace after the repair, and cleanup

What you won't get

Work you haven't approved
Pressure to replace a furnace that can be repaired
Swapping parts until something works
Gas leak response. For a gas smell, leave and call 911 and NW Natural.

What usually goes wrong with a gas furnace?

Many furnace problems trace back to a short list of parts. Each one has a job in the start-up sequence, and when one fails, the furnace often shuts itself down to stay safe.

What the furnace does when it fails is a good clue. The table shows common patterns and what you can check yourself.

Igniter: gets hot enough to light the gas. When it wears out, the furnace tries to start but never lights.
Flame sensor: proves a flame is there. A dirty sensor can make the furnace light, then shut off seconds later.
Limit switch: turns the burners off if the furnace runs too hot, often because airflow is blocked.
Pressure switch and inducer motor: make sure exhaust is venting before the burners light.
Blower motor and capacitor: push warm air through your ducts.
Filter: when it clogs, airflow drops and safety switches can shut the furnace down.

What you notice	One common cause	Can you check it?
Lights, then shuts off in seconds	Dirty flame sensor	No. Leave it for a technician.
Clicks or hums but never lights	Worn igniter or a pressure switch problem	No. Leave it for a technician.
Runs a short time, then shuts off	Clogged filter tripping the limit switch	Yes. Check the filter.
No sign of life at all	Tripped breaker, power switch off, or loose door panel	Yes. Breaker once, switch, door.
Fan runs but the air is cold	Burners not lighting, or thermostat fan set to On	Yes. Set the fan to Auto.

What does a technician check on a furnace repair visit?

A technician starts with what you saw, then tests the furnace step by step until the cause is clear. The goal is the root cause, not just the part that failed last.

If a part failed because of something else, fixing only that part means it may fail again. A limit switch that trips from a blocked return is one example. We look for that.

The thermostat signal and wiring at the furnace
The filter, return grilles, and overall airflow
The start-up sequence: inducer, pressure switch, igniter, burners, and flame sensor
Limit and rollout switches, and why they tripped if they did
The blower motor, capacitor, and blower wheel
The vent pipe and condensate drain on high-efficiency furnaces
Any fault code from the control board's status light

When is a furnace problem a safety issue?

A rotten-egg smell or a carbon monoxide alarm is a safety issue, not a repair call. Leave the house first. Call for help from outside.

Other signs mean you should turn the furnace off at the thermostat and call. These include a burning plastic or electrical smell, scorch marks, or a breaker that trips again after one reset. Don't bypass switches or keep restarting the furnace to get heat.

Gas smell: leave now. Don't use switches or phones inside. From outside, call 911 and NW Natural at 800-882-3377. Carbon monoxide alarm: get everyone into fresh air and call 911.

Should you repair or replace your furnace?

Repair is usually the right call when one part has failed and the rest of the furnace is sound. We fix what can be fixed, and we tell you straight when it can't.

Replacement starts to make sense when repairs keep stacking up, a major part like the heat exchanger has failed, or the parts you need are hard to get. If that's where we land, we say so and show you why, so you can see it for yourself. You decide either way.

Got a quote that says “replace” with no repair option? Ask for the repair price and the replacement price side by side before you choose.

How much does furnace repair cost?

The cost depends on what failed, so no one can give an honest repair price before the cause is found. Cleaning a flame sensor and replacing a blower motor are very different jobs.

Here's what you can count on. Ask us about the diagnostic fee when you call. You'll get the repair price before any work starts. If it doesn't work for you, you can say no.

Which part failed, and whether it has to be ordered
How long the repair takes
Whether a second problem caused the first one

What happens when you book a furnace repair?

Every furnace repair visit follows the same six steps, so you know what's coming.

1Tell us what's going on. Call and describe what the furnace is doing and when it started.
2A technician finds the cause. They check the system and look for the root problem, not just the symptom.
3You see your options. We explain what's wrong and what it takes to fix it. If replacing makes more sense, we say so and show why.
4You decide. No work starts until you say yes.
5We fix it. If it can be fixed, we fix it.
6We test and clean up. We run the furnace, check that it heats, and leave the space clean.

Common questions

Is it safe to keep resetting my furnace?

No. A furnace that keeps shutting itself off is usually doing it for a reason, like overheating or a venting problem. Restarting it over and over can hide a safety issue. Turn it off at the thermostat and call.

Do you charge to come look at my furnace?

Ask us about the diagnostic fee when you call. After the technician finds the cause, you get the repair price before any work starts. Nothing happens until you say yes.

Can my furnace be fixed on the first visit?

It depends on what failed. Some fixes, like cleaning a flame sensor, are quick. Others need a part that has to be ordered. You'll know which before any work starts.

How often should I change my furnace filter?

Check it every month and change it when it looks dirty. ENERGY STAR says to change it at least every three months. A dirty filter slows airflow and makes the system work harder.

Can I clean the flame sensor myself?

Leave it for a technician. The sensor sits in the burner area, next to gas parts and wiring. A technician can also check whether a dirty sensor is the real problem or a sign of something else.

What should I do if I smell gas near my furnace?

Leave the house right away, even if the smell seems mild. Don't use switches, phones, or flames inside. From outside, call 911 and NW Natural's 24-hour line at 800-882-3377. Once they say it's safe, we can look at the furnace.

Will you tell me if my furnace isn't worth fixing?

Yes. If replacing makes more sense, we say so and show you why. If it can be fixed, we fix it. The choice is always yours.