Furnace
The Blinking Light on Your Furnace Is Talking: How to Read Error Codes
The LED behind your furnace's panel window blinks a code. Count the flashes, check the door legend, and learn what common codes mean and which are DIY.
Formerly Adam & Sam Brothers RepairWoodinville · Furnace service
Woodinville furnace repair for newer, high-efficiency homes
Most Woodinville homes are from 1980 or later, and close to half went up after 2000. That means condensing gas furnaces, variable-speed blowers and electric air handlers. We diagnose them carefully, write one price and repair them, 18–23 minutes from our shop.
- Built since 2000
- About 44% of homes, plus 37% from the 1980s and 1990s
- Heating split
- About 51% electric and 47% gas, per Census estimates
- Utility
- PSE runs both the power lines and the gas mains
- $85 diagnosticBecomes part of the repair price when you say yes. If you pass on the repair, that visit is all you pay.
- Up to $18 offAny repair requested through the online form. The diagnostic itself is never reduced.
- No-charge site visitInstalls are quoted in writing, equipment and installation work in one number.
Woodinville incorporated in 1993 and has grown quickly since, from the downtown apartment blocks along SR 522 to the larger homes on the hills of the 98077 ZIP. Census figures show about 44% of homes were built in 2000 or later, with 37% more from the 1980s and 1990s, and roughly a quarter of all units sit in big apartment buildings of 50 or more. So the furnaces we see here are mostly young by regional standards: 90%-plus condensing gas units, two-stage and modulating models, and electric air handlers working with heat pumps. Visitors come for the wineries and tasting rooms; our furnace calls come from the neighborhoods around them.
Younger equipment fails differently from older furnaces. Instead of worn burners and rusted heat exchangers, the typical Woodinville call involves a condensate drain that has backed up, a pressure switch reacting to a blocked vent, a variable-speed blower module that has lost its programming, or a control board reporting a fault. Many of these furnaces also talk to a communicating thermostat, and a loose wire there can look like a dead furnace. We read the stored codes and test parts before naming a cause, then put the price in writing. Common parts ride on the van, so many repairs end on the first visit. Two-stage furnaces can hide a fault, running fine on low fire and failing only when high fire is called on the coldest days, so we test both stages.
Woodinville furnace symptoms and causes
Furnace shuts down with a pressure switch or drain code
- Likely cause
- Condensate trap full, drain line clogged or a vent pipe blocked
- What we do
- Clean the trap and line, check the vent terminations outdoors and confirm the switch reads correctly
Blower runs at the wrong speed or not at all
- Likely cause
- ECM motor or its control module has failed
- What we do
- Test the motor and the board's signals, then replace the module or the motor
Modulating furnace runs constantly at low fire
- Likely cause
- Thermostat communication fault or a sensor reading wrong
- What we do
- Check the communicating thermostat and wiring, then test the furnace's sensors
Gas furnace clicks repeatedly but will not light
- Likely cause
- Igniter cracked or weak, or an oxidized flame sensor
- What we do
- Measure the igniter, polish or swap the sensor, then watch several full heat cycles
Electric air handler blows cool air in backup mode
- Likely cause
- Failed heat strip or sequencer
- What we do
- Meter the strips and relays, swap whichever has opened, and inspect the breaker lugs
Gas smell indoors
- Likely cause
- Possible leak
- What we do
- Leave the house at once; from outside call PSE at 1-888-225-5773 or 911 and wait for their all-clear
Woodinville housing, snow and a single utility
Downtown Woodinville's apartment and condo buildings, many from the last two decades, lean on electric heat, often a heat pump with an air handler or a compact electric furnace in a closet. Repairs inside those units are usually heat strips, sequencers, blower motors and thermostats. We look after the equipment serving your space and write down anything that belongs to the building's own systems, so management gets a clear note rather than a guess. Closets in these units are small, so we bring only what the job needs and work tidily around your things.
Out on the hills of the 98077 ZIP, homes are larger and often have the furnace in a garage, a basement or an attic. Attic furnaces are a particular challenge: the condensate drain has to work every time, and a clog can send water through the ceiling. We check the overflow safety switch and the secondary drain pan on every attic furnace visit. Some of these larger homes also run two furnaces, one per floor, which means two sets of filters, drains and thermostats to keep in order. Attic ducts also lose heat to the cold space above the ceiling, so we check the insulation on supply runs whenever we are up there.
Since PSE is the only utility involved here, for power and gas alike, its heat pump offerings are the ones we look into when you ask about adding one or going dual fuel. Weather matters too: on April 18, 2008, a Convergence Zone band dropped about 6.5 inches of snow on Woodinville, and when snow piles up around sidewall vents, condensing furnaces lock out on pressure switch codes. You can safely sweep snow off the vent ends yourself. We come in on I-405 and SR 522 and reach most of the city in 18 to 23 minutes off-peak. From SR 522, Woodinville–Duvall Road and NE 175th St take us to most homes.
What furnace work costs in Woodinville
Furnace repair in Woodinville starts at $285. On the newer condensing furnaces here, pressure switches and control boards account for many of our calls, with a board at the upper end. If a furnace is beyond repair, a 95% condensing replacement starts at $6,500, equipment and installation included. When the fault sits in a communicating thermostat or a zoning control instead, the written estimate says so. These are opening prices for our region, not a quote; the written estimate that follows the diagnosis shows your exact number, and the replacement site visit and written quote cost nothing.
- Flame sensor cleaning or replacementfrom $285
- Furnace igniterfrom $285
- Limit switchfrom $285
- Pressure switchfrom $285
- Sequencer or heat relayfrom $285
- Electric heat strip / elementfrom $285
- Furnace or air handler control boardfrom $425
- Gas valvefrom $425
- Blower motor (standard PSC)from $475
- Inducer motorfrom $550
- Blower motor (ECM / variable speed)from $850
- Diagnostic visit$85, included in the repair
Starting prices for the north Seattle area, 2026. The $85 diagnostic is included in any repair you approve, and the exact price is in the written estimate before work starts.
System, installed
- Gas furnace, 80% AFUEfrom $4,750
- Gas furnace, 95%+ AFUEfrom $6,500
- Electric furnacefrom $4,500
- Heat pump outdoor unit onlyfrom $5,250
Install prices start here, equipment and installation included, before any utility program. Multi-zone systems are priced after a visit. We do not charge for the site visit or the written quote.
Repair or replace a newer Woodinville furnace
With so many Woodinville furnaces under twenty years old, repair is usually the right answer. A ten- or twelve-year-old condensing furnace has a long life ahead, so a pricey part like a variable-speed motor or a board still makes sense to replace inside it. The math changes when a furnace from the late 1980s or 1990s needs several major parts at once, say an inducer plus a blower, or shows a cracked heat exchanger; those are replacement candidates, and the new unit will almost certainly be a 95% model. If you already have a heat pump and an electric air handler, a failed strip or sequencer is a small repair. For gas homes, the larger question is whether pairing the furnace with an outdoor heat pump unit is worth it for the cooling and the lower gas use. We write every option out with prices so you can compare them before deciding, and none of them expire the moment we leave.
Common questions
Do you service furnaces in Woodinville apartments and condos?
Yes. We repair the furnace, air handler or heat strips that serve your unit, along with its thermostat. Let us know about parking, access codes and where the equipment is located. If the problem is in something the building controls, such as a shared vent or electrical supply, we document it for your manager.
My attic furnace's drain pan has water in it. Is that a problem?
Yes. The secondary pan should stay dry; water there means the main condensate drain is clogged or leaking. If the overflow switch has shut the furnace off, it is doing its job. Call us to clear the drain and check the trap before the pan fills and water reaches the ceiling.
Why does my furnace lock out after a snowstorm?
Condensing furnaces draw combustion air and vent exhaust through PVC pipes, often on a side wall. Snow drifts can cover those openings, and the pressure switch shuts the furnace down. Clear the snow from the vent ends by hand, then reset the furnace once. If it still will not run, call us.
Is it worth adding a heat pump to my gas furnace?
Often it is, especially if you want cooling. A heat pump covers most of Woodinville's mild heating days and all of the summer cooling, while the gas furnace takes the coldest nights. Our technicians handle the refrigerant work under EPA Section 608 rules, and we look into which PSE programs your home might qualify for.
How soon can you reach Woodinville?
Plan on 18 to 23 minutes from our shop when I-405 is moving. Calls that come in during the morning, Monday through Saturday, generally get a technician that afternoon. Mentioning the model number from the sticker and whatever the status light is blinking lets us pack the likely part before we head your way.
Talk to Adam & Sam
Woodinville homeowners can phone (425) 570-9520 or schedule online and take up to $18 off the repair bill. Approve the repair and the $85 diagnostic counts toward it; the visit to measure for a new furnace or heat pump is ours to cover.
From Sam’s repair notes
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Schedule a repair
Request a visit from Adam & Sam
Send the basics and we call you back with an arrival window, most days the same morning.
- $85 diagnostic Becomes part of the repair price when you say yes. If you pass on the repair, that visit is all you pay.
- Up to $18 off Any repair requested through the online form. The diagnostic itself is never reduced.
- $10 off A second appliance’s diagnostic when we check it during the same trip.