HVACopediaGoodman · Furnace
E5 Control fuse open
What the control is telling you
The 3 A fuse on the control board is blown, usually from a short in the 24 V wiring. A ComfortNet thermostat runs on battery power and shows Battery Power.
Applies to: GMVC95/AMVC95 upflow and *CVC9 counterflow two-stage furnaces
Likely causes
- Short in the low voltage wiring (thermostat, outdoor unit, accessories)
Test and repair steps
- Safety turn power off before working on the control or wiring.
- Find the short in the 24 V wiring first: thermostat cable, outdoor unit wires, humidifier or other add-ons.
- Replace the fuse with a 3 A automotive type fuse only.
Settings for these units
- Normal status displays (7-segment) · Goodman/Amana GM9S96/AM9S96
- Normal status displays (7-segment) · Goodman/Amana GM9S80/AM9S80
- Normal status displays (7-segment) · Goodman/Amana GM9C96/AM9C96
- Minimum recommended filter size · Goodman/Amana GM9C96/AM9C96
Models that show this code
10 models in Goodman/Amana *MVC95/*CVC9 two-stage ComfortNet
Other codes on the same units
- E1 Low-stage pressure switch closed at start of heat
- E2 Low-stage pressure switch will not close
- E3 High limit or rollout limit open
- E4 Flame sensed with no call for heat
- E6 Low flame signal
- E7 Igniter circuit fault
- E8 High-stage pressure switch closed at start of heat
- E9 High-stage pressure switch will not close
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Source: Goodman *CVC9/95 & *MVC95 Installation Instructions IO-341D (08/2010), Troubleshooting Chart p.53-57. Summarized in our own words; check the original manual for your model.
Homeowner looking at this code? See what it means for you and when to call a technician.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.