Goodman furnace: Open Fuse (E5)
Professional repair
What does E5 mean on a Goodman furnace? The control detects its onboard fuse open and inhibits all operation except displaying the code. Official probable cause: a short in the low-voltage wiring.
GOOD NEWS: THE FIRST CHECKS ARE FREE AND TAKE MINUTES.
Try these first — in this order
Inspect thermostat wire for bare spots, replace the blade fuse with the SAME rating.
Fuse blows again immediately = live short, tech time.
What causes it (in order of likelihood)
- Shorted 24V (thermostat) wiring — often nicked during other work DIY-CHECKABLE
- Board fuse blown DIY-CHECKABLE
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.
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 |
|---|---|
| E4 | Flame Sensed With No Call for Heat (E4) |
| E6 | Low Flame Sense Signal (E6) |
| E3 | Open Primary, Auxiliary, or Rollout Limit (E3) |
| E7 | Igniter Fault or No Ground (E7) |