Goodman Furnace 2 Flashes — Pressure Switch Stuck Closed / Open
Two flashes on many Goodman boards point to a pressure-switch fault — the switch is closed when it should be open, or the control cannot get the expected open/closed sequence. Always read your door sticker; flash maps vary by board revision.
Updated July 2026 · 6 min read · Canada
Symptoms
- Furnace will not stay in heat
- LED repeats a 2-flash pattern
- Inducer may start briefly then stop
Likely causes
- Blocked or iced intake/exhaust termination
- Disconnected or cracked pressure tubing
- Failed inducer motor or capacitor
- Stuck pressure switch
What to do
1. Clear outdoor terminations
In winter, check the PVC intake and exhaust for snow, ice, leaves, or nests. Restricted venting is the most common homeowner-fixable cause.
2. Check the condensate path
If your furnace has a condensate trap or collector box, a clog can confuse pressure readings. Clear standing water only if you can do so without opening sealed combustion paths you do not understand.
3. Listen for the inducer
A weak hum with no spin often means a failed inducer capacitor or motor — that is a parts job for a technician.
Stop and call a pro when
- Vents are clear but 2 flashes continue
- You smell exhaust indoors
- The inducer will not start or shrieks loudly
Related guides
- Goodman 3 Flashes — Diagnose Goodman (and Amana) furnace LED 3-flash codes: pressure switch, inducer, and flame-sensing failures — plus the parts that usually fix them.
- Goodman 1 Flash — Diagnose Goodman 1-flash ignition failure: dirty flame sensor, weak ignitor, and gas-valve issues — plus the parts homeowners most often replace.
FAQ
Is Goodman 2 flashes the same as 3 flashes?
No. Maps differ by board, but 2-flash and 3-flash patterns usually point at different pressure-switch or ignition stages. Trust the sticker on your door.
Need a licensed tech instead?
If the guide says to stop — or the part swap did not clear the fault — get free quotes from licensed local HVAC contractors.
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