Amana AMVM970803BN Error Code EE5: Open Fuse / Low Voltage Short
What Does Code EE5 Mean?
Error code EE5 on the Amana AMVM970803BN indicates either a fuse on the control board has blown open, or there is a short circuit in the low voltage (24VAC) wiring circuit. The furnace has no 24-volt power to operate its controls, thermostat connections, or accessories, so it cannot function at all.
The low voltage fuse on the control board protects the 24VAC transformer and wiring from damage caused by short circuits. When a short occurs, the fuse opens to break the circuit before the transformer is damaged. Common sources of low voltage shorts include chafed or pinched thermostat wiring that allows the R (hot) wire to contact the C (common) wire, a failed connected accessory such as a humidifier or zone controller, or damaged wiring inside the furnace cabinet.
Simply replacing the fuse without finding and correcting the underlying short will cause the new fuse to blow immediately. A technician must systematically isolate each circuit connected to the 24VAC system — disconnecting thermostat wires at the control board, disconnecting accessories one at a time — until the short is identified. Once the short is repaired, the fuse can be replaced and the furnace should resume normal operation.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Blown fuse on control board | Most common | ✗ Call a pro → |
| Short circuit in low voltage (24V) wiring | Most common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- EE5 displays — a technician must locate and correct the short in the low voltage wiring before replacing the fuse; replacing the fuse without finding the short will cause immediate re-failure
- If the fuse blows immediately after replacement, the short has not been found and further diagnosis is required
- Chafed thermostat wiring behind walls or at junction boxes may require professional tracing and repair
✓ Verified against manufacturer service manual — March 2026