Goodman furnace: Ignition Lockout (E0)
Try DIY first, then call a pro
What does E0 mean on a Goodman furnace display? Three failed ignition cycles — the control can't establish measurable combustion and locks out. Same reset as flash models: thermostat OFF 5–20 s, or kill power ≥5 s.
This condition involves the gas or combustion side. If you smell gas or a CO alarm sounds: leave, then call your gas utility. Diagnostic info here is reference — combustion repairs are for licensed technicians. All six emergency signs →
GOOD NEWS: THE FIRST CHECKS ARE FREE AND TAKE MINUTES.
Try these first — in this order
Clean the flame sensor first; watch whether the igniter glows during the ignition attempt.
Repeated lockouts after cleaning = gas pressure or valve diagnosis. DIY part cost: $8–15 / $15–35 — a pro visit for this class of fault typically runs $150–350.
What causes it (in order of likelihood)
- Dirty flame sensor DIY-CHECKABLE
- Bad igniter or gas-supply issue DIY-CHECKABLE
Parts referenced by this code
Always match parts against your model's parts list — part numbers vary within a series.
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.
Verified against Goodman GMVC96/GCVC96 Service Manual, p.44
Last verified 2026-07-06 · how we verify
Related Goodman fault codes
These codes use the same dual 7-segment display (two-stage variable-speed) system.
| Pattern | Meaning |
|---|---|
| E1 | Low-Stage Pressure Switch Stuck Closed (E1) |
| E2 | Low-Stage Pressure Switch Stuck Open (E2) |
| E3 | Open Primary, Auxiliary, or Rollout Limit (E3) |
| E4 | Flame Sensed With No Call for Heat (E4) |