Goodman furnace code E8: High-Stage Pressure Switch Stuck Closed
Professional repair
What does E8 mean on a Goodman furnace? The high-stage pressure switch is stuck closed when high stage is commanded — the furnace runs on LOW stage only regardless of thermostat demand.
Before you touch anything: the six signs that mean stop troubleshooting and call a pro →
GOOD NEWS: THE FIRST CHECKS ARE FREE AND TAKE MINUTES.
Try these first — in this order
None safe — two-stage pressure circuit.
Two-stage switch diagnosis and replacement. DIY part cost: $25–60 — a pro visit for this class of fault typically runs $150–350.
What causes it (in order of likelihood)
- Stuck high-stage pressure switch or wiring TECH
Parts referenced by this code
Always match parts against your model's parts list — part numbers vary within a series.
Questions about this code
What does E8 mean on a Goodman furnace?
The high-stage pressure switch is stuck closed when high stage is commanded — the furnace runs on LOW stage only regardless of thermostat demand.
How do I fix Goodman furnace code E8?
You may notice weaker heating on cold days. There's no safe homeowner fix; a technician should diagnose the two-stage pressure circuit.
How much does it cost to fix Goodman furnace code E8?
Cost depends on whether the switch or its wiring is at fault. Because the furnace still runs on low stage, you may have some flexibility in scheduling service.
Applies to
GMVC96 · GCVC96
Different Goodman generations use different code maps. If your series isn't listed, don't assume this meaning — check your blower-door label.
Same control platform, same code: Amana furnace code E8
Verified against Goodman GMVC96/GCVC96 Service Manual, p.44
Last verified 2026-07-06 · page updated 2026-10-03 · how we verify
Related Goodman furnace codes
These codes use the same dual 7-segment display (two-stage variable-speed) system.
| Pattern | Meaning |
|---|---|
| E7display E7 | Igniter Fault or No Ground (E7) |
| E9display E9 | High-Stage Pressure Switch Stuck Open (E9) |
| E6display E6 | Low Flame Sense Signal (E6) |
| EAdisplay EA | Reversed Line Polarity (EA) |