Goodman furnace: Pressure Switch Stuck Closed
Professional repair
What does 2 flashes mean on a Goodman furnace? The control sees the pressure switch closed while the induced-draft blower is OFF — it waits until the fault clears. Officially: a faulty pressure switch or shorted wiring.
GOOD NEWS: THE FIRST CHECKS ARE FREE AND TAKE MINUTES.
Try these first — in this order
Only check for loose or pinched wires at the switch.
Low-voltage circuit diagnosis is a tech job. DIY part cost: $25–60 — a pro visit for this class of fault typically runs $150–350.
What causes it (in order of likelihood)
- Faulty pressure switch (official first cause) TECH
- Short in the pressure-switch wiring TECH
Parts referenced by this code
Always match parts against your model's parts list — part numbers vary within a series.
Applies to
GMS8 · GDS8 · GHS8 · GMSS96 · GMH8 · GDH8
Different Goodman generations use different code maps. If your series isn't listed, don't assume this meaning — check your blower-door label.
Verified against Goodman GMS8/GDS8/GHS8 Service Manual (RS6612006), p.42-43 — “two short flashes followed by a longer pause”
Verified against Goodman GMSS96 Service Manual, p.32
Last verified 2026-07-06 · how we verify