Goodman Furnace 2 Flashes: Pressure Switch Stuck Closed

Last updated Sep 15, 2026 · By fixme.vip Editorial

Goodman furnace 2 flashes: what it means

Two flashes on your Goodman furnace control board means the pressure switch was already closed before the inducer motor started. The board checks that switch at the start of every heating cycle: it should be open when the inducer is off, then close once the inducer creates draft. If it reads closed too early, the board interprets that as a stuck switch or shorted wiring and refuses to fire the burners.

This is a safety check. The pressure switch’s whole job is to confirm the venting is drawing properly before gas ignites. If the board can’t trust that reading, it won’t proceed — which is why 2 flashes leaves you with no heat.

On most Goodman integrated boards the fault clears automatically once the switch opens (or after you cycle power) and the board retries the sequence. If the condition persists it will keep re-flashing. Flash legends are printed on the blower-compartment door label and can differ slightly by board revision, so confirm that 2 flashes on your specific unit means “pressure switch stuck closed” before acting on this page.

Goodman furnace 2 flashes: common causes, ranked by probability

1. A pressure switch that has failed closed — the switch contacts weld or stick in the closed position and never open, so the board sees a closed circuit at rest.
2. Shorted or pinched wiring in the pressure-switch circuit — a wire chafed against sheet metal or a damaged connector shorts the two terminals together, mimicking a stuck-closed switch.
3. Moisture or debris in the switch or its hose condensing and bridging the contacts, causing a false closed reading. Common on high-efficiency (condensing) models.
4. A wrong or aftermarket pressure switch with the incorrect pressure rating or normally-closed vs normally-open configuration installed during a prior repair.
5. A faulty control board reading the input incorrectly — least common, diagnosed only after the switch and wiring check out.

Note: gas supply, igniter and flame-sensor problems belong to Goodman’s ignition/flame-proving codes (see 1 flash), not to this pressure-switch fault. Don’t let a tech chase those on a 2-flash code.

How to fix Goodman furnace 2 flashes: safe checks first

These are the only steps a homeowner should perform. Everything else on this page is inside the cabinet and is technician work.

• Check your air filter. A severely clogged filter restricts airflow and can contribute to abnormal draft/pressure behavior. Replace it if it’s dirty.
• Confirm the thermostat is set to Heat with the setpoint above room temperature, and replace the thermostat batteries if it uses them.
• Reset the breaker or furnace switch once. Flip the furnace power switch (or breaker) off, wait 30 seconds, and back on to let the board retry. Do this once — do not repeatedly reset a furnace that keeps locking out.
• Check visible supply and return registers are open and unblocked so the system isn’t fighting airflow restriction.
• Inspect the condensate drain (on condensing models) for standing water or a clogged line. A backed-up drain can flood the pressure-switch hose. You may clear a visibly blocked exterior drain line, but don’t disassemble anything inside the cabinet.
• Make sure the blower door / access panels are fully seated — a loose panel can trip the door switch and confuse startup.

If the 2-flash code returns after one reset, stop and call a technician.

How a technician will diagnose it

A qualified tech will work the pressure-switch circuit in order so you can sanity-check the quote:

1. Read the flash code and confirm the legend on the door label for your board revision.
2. Measure the pressure switch with a multimeter at rest — with the inducer off, the switch should be open. If it reads closed (continuity) with no draft, the switch has failed closed.
3. Inspect the switch wiring and connectors for chafing, pinch points, corrosion or a short between terminals against the cabinet.
4. Check the switch hose and port for moisture, blockage or condensate — common on condensing furnaces.
5. Verify the correct switch part number and pressure rating, especially if a prior repair was done.
6. Test the board input only after the switch and wiring are confirmed good — replacing the board is a last resort.

A good tech confirms the switch is actually stuck before replacing parts. Being quoted a new inducer or gas valve on a straight 2-flash code is a red flag — those aren’t part of this fault.

Symptom, cause and what to do

Goodman furnace 2 flashes repair cost

Honest US ranges, parts and labor included where noted:

• Homeowner reset / filter swap: $0 (plus ~$15–$40 for a filter if needed).
• Pressure switch replacement: roughly $150–$350 installed. The switch itself is often $20–$70; the rest is diagnostic labor and a service-call fee.
• Wiring / connector repair: $100–$250 depending on access and how much harness needs work.
• Hose or port cleaning + condensate correction: $100–$200 if the drain system needs attention alongside the switch.
• Control board replacement: $350–$700 installed — only after the switch and wiring are confirmed good.

Service-call / diagnostic fees of $90–$180 are typical and often applied toward the repair. Get the specific failed component named on your invoice.

Related codes

• Goodman Furnace 1 Flash: Ignition Failure Lockout Fixes — for no-ignition and flame-proving faults (a different circuit entirely).
• Goodman Furnace Lockout: Causes, Fixes & Costs — when the board holds in lockout and won’t retry.
• Goodman Furnace Flame Rollout: Shut Down Now — burning smell or rollout; shut down and call a pro.
• Goodman AC Running But Not Cooling: Causes & Costs — for cooling-side complaints with no error codes.