Amana AMVC960803BN Error Code EE5: Open Fuse
What Does Code EE5 Mean?
Error code EE5 on the Amana AMVC960803BN indicates that the overcurrent protection fuse on the integrated control module has opened. This small fuse protects the 24VAC transformer and control board from damage caused by excessive current draw in the low-voltage circuit. When it blows, the furnace loses all 24VAC power and cannot operate.
The fuse almost never fails on its own — it is a symptom of a short circuit somewhere in the 24VAC wiring. Common locations for shorts include the thermostat wire (especially if it has been pinched during installation or chewed by pests), the wiring to any 24VAC accessory such as a humidifier, electronic air cleaner, or zoning equipment, or a shorted component like a relay or motor starter connected to the low-voltage system. The short may be inside the furnace cabinet or in the external thermostat wiring.
Replacing the fuse without finding and fixing the short will cause the new fuse to blow immediately. A technician will systematically disconnect each 24VAC load, then restore power and observe whether the new fuse holds. This process identifies which circuit contains the short.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Short in low voltage wiring (internal or external) | Most common | ✗ Call a pro → |
| Blown 3-amp fuse on control board | Most common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- A technician must locate and repair the short circuit before the fuse can be successfully replaced — replacing the fuse alone will not fix the problem
- The short is suspected in the thermostat wiring inside walls or at junction boxes — professional tracing of the wiring is required
- A 24VAC accessory (humidifier, zone board, UV light) is the source of the short — the accessory must be properly repaired or replaced
Sources
✓ Verified against manufacturer service manual — March 2026