2 red flashes: Pressure switch stuck closed
Call a technician
The board checks that this switch is open before the inducer starts. If it reads closed, it will not even try. Faulty switch, shorted switch wires, or a stuck inducer relay, per the manual.
From the table: Red-LED chart — two-stage 96% furnaces — source: Goodman GCEC960803BN Installation Instructions, Troubleshooting Chart, pp. 55-56 (read the document, fetched 2026-10-30). Covers: GMEC96 / GCEC96 and their Amana twins — the current two-stage condensing furnaces with a green/amber/red LED trio on the board.
The sequence matters here. Before the inducer spins up, the control checks that the pressure switch is open — proof the switch is not welded shut or shorted. If it reads closed at rest, the board stops right there and flashes 2. Goodman's chart names three causes: a faulty pressure switch, shorted pressure-switch wires, or the board's own inducer relay stuck closed.
There is no vent-clearing fix for this one, because the vent is not involved yet — the failure happens before the inducer runs. It is a meter-and-parts diagnosis.
Call a technician — the safe list:
- Run the basics once: thermostat calling for heat, filter clean, power switch on, blower door seated.
- If the code returns, that is the end of the homeowner list. This fault lives inside the cabinet, and the part it names needs testing with a meter.
Older single-LED board? Your 2 flashes mean the opposite
On the older control in Goodman's PG-series instructions, 2 flashes = pressure switch stuck open — the inducer runs and the switch never closes. That version does have a homeowner list: check the outdoor vent terminal for blockage, look at the condensate drain on condensing models, and confirm the hose to the switch is connected (that last one is a look, not a fix). The manual's causes: faulty switch, faulty wiring, disconnected or damaged hose, blocked or restricted flue, faulty inducer.
Two boards, two opposite meanings, one blink count. This is why this library prints the board name on every table — and why the chart inside your blower door outranks us.
The two rules that outrank everything on this page.
1. Smell gas? Stop reading. Leave the house and call your gas utility or 911 from outside. No code is worth diagnosing through a gas smell.
2. Never bypass a safety switch — no jumping a pressure switch, no taping a limit, no propping a rollout. Those switches are the only thing between a furnace fault and a fire or carbon-monoxide problem. This library explains codes; it does not teach repairs inside the cabinet.
One honesty note before the tables: codes change between control boards, sometimes inside the same brand and the same decade. Every table below names the board and the manual it was transcribed from. The chart glued inside your own blower door is the final word for your furnace — if it disagrees with this page, believe the door.