Amana AMVM970803BN Error Code EE5: Open Fuse / Low Voltage Short
What Does Code EE5 Mean?
Code EE5 means the control board's fuse is open or there is a short in the 24-volt low-voltage wiring. The furnace cannot operate because its control circuit has lost power protection, and simply replacing the fuse without finding the short will only blow it again.
The 24-volt circuit powers the thermostat connection, the gas valve, and the safety switches. A short — often from a pinched or chafed thermostat wire or a fault at a connected component — draws excessive current and blows the fuse to protect the board.
EE5 is distinct from a completely blank display (code None), which is a total loss of power to the module. With EE5 the board can still flag its own low-voltage fault. It sits with the other electrical-supply codes E10 (grounding) and EEA (reversed polarity).
What You'll Notice
- The furnace will not operate and the display shows EE5
- The fault may follow recent thermostat or accessory wiring work
- A replaced fuse blows again quickly
- No response to the thermostat
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 → |
How This Is Diagnosed
A technician isolates the low-voltage short by checking the thermostat wiring and each 24-volt component and connection for a chafed, pinched, or grounded wire. The short must be found and corrected before the fuse is replaced.
Once the short is repaired and the fuse replaced, the circuit is verified to hold. This is line-adjacent electrical diagnosis that should be performed by a professional.
When to Call a Professional
This code involves components that are not homeowner-serviceable, so have a licensed HVAC technician diagnose and repair it. Keep in mind:
- The display shows EE5 and the furnace will not run
- A newly replaced fuse blows again
- The fault appeared after thermostat or accessory wiring was changed
Frequently Asked Questions
Can I just replace the blown fuse?
Replacing the fuse alone will not help if a short is still present — it will blow again immediately. A technician needs to find and repair the short in the 24-volt wiring first.
What usually causes the low-voltage short?
Often a pinched or chafed thermostat wire, or a fault at a component on the 24-volt circuit. A technician traces the circuit to locate it.
✓ Verified against manufacturer service manual — March 2026