Goodman GMEC96 furnace 4 amber flashes: Cooling Call Without a Fan Call
Professional repair
What do 4 amber flashes mean on a Goodman GMEC96 furnace? Four amber flashes mean the GMEC96 control is getting a cooling call (Y or Ylo) without a fan call (G), and the furnace won't operate. Goodman's chart points to a faulty thermostat, faulty thermostat wiring, or improperly connected thermostat wires. In normal cooling the thermostat sends G along with Y or Ylo, and the control shows one or two green flashes.
Easy to confuse with: Goodman GMEC96 furnace 4 red flashes (Open Limit Switch)
Before you touch anything: the six signs that mean stop troubleshooting and call a pro →
A technician should check the thermostat and its wiring for the missing G signal. Mention any recent thermostat replacement or rewiring.
What causes it (in order of likelihood)
- Faulty thermostat TECH
- Faulty thermostat wiring TECH
- Improperly connected thermostat wires TECH
Parts for this code
No specific part number is verified for this code — it typically points at wiring, power, a blown fuse, or communication between components rather than one standard replacement part. If your diagnosis does land on a replaceable component, match its part number against your model's parts list before ordering.
Questions about this code
What do 4 amber flashes mean on a Goodman GMEC96 furnace?
Four amber flashes mean the GMEC96 control is getting a cooling call (Y or Ylo) without a fan call (G), and the furnace won't operate. Goodman's chart points to a faulty thermostat, faulty thermostat wiring, or improperly connected thermostat wires. In normal cooling the thermostat sends G along with Y or Ylo, and the control shows one or two green flashes.
How do I fix Goodman GMEC96 furnace 4 amber flashes?
Don't rewire the thermostat or the furnace control yourself. Book a technician to trace the missing fan (G) signal, and mention any recent thermostat replacement or wiring work.
How much does it cost to fix Goodman GMEC96 furnace 4 amber flashes?
Cost depends on whether the fix is a wiring correction or a new thermostat.
Applies to
GMEC96
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 GMEC96 Service Manual, p.52 — “Furnace does not operate, four Amber flashes on control board / Ylo or Y call present without G / Faulty thermostat or thermostat wiring or improperly connected thermostat wires”
Verified against Goodman GMEC96 Service Manual, p.70 — “4 FLASHES = Y PRESENT WITH NO G CALL, YLO PRESENT WITH NO G CALL”
Verified against Goodman Diagnostic Code Identification System (GMEC96; 4 Amber Flash) — “Y Present With No G Call, Y1 Present With No G Call”
Last verified 2026-10-20 · page updated 2026-10-20 · how we verify
Other Goodman furnace codes
These links include other Goodman model families. Code meanings can change by model and control board, so confirm your model and service manual before using a definition.