Amana AMVC960803BN Error Code EE5: Open Fuse

What Does Code EE5 Mean?

This furnace runs its thermostat, safety switches, gas valve, and relays on a 24V control circuit that the onboard transformer supplies. Amana protects that circuit with a 3-amp automotive-type fuse on the Integrated Control Module. When too much current flows, typically because a low-voltage wire has shorted to the metal cabinet or two conductors have touched, the fuse opens to protect the transformer and board, and the display reports EE5 with no furnace operation.

The short can be internal to the furnace (a pinched or chafed wire, a failed component) or external (damaged thermostat wire, a stapled-through cable, or a shorted accessory like a humidifier). Simply replacing the fuse without finding the short only blows the new fuse, so the manual's direction is to locate and correct the short first, then fit a fresh 3-amp automotive-type fuse. This is diagnostic and wiring work, not a homeowner task.

EE5 belongs to this model's electrical family, and it helps to see how the members differ. A plain no-power blank display means the board is entirely unpowered (breaker, disconnect switch, or door panel), while EE5 means the board is present but its own control fuse is open. EEE is an internal control fault the board detects in itself; EEA is reversed 115V line polarity; and E10 is a grounding fault from a poor neutral. Because a blown control fuse cuts 24V, EE5 can superficially resemble those supply codes, but here the specific failure is the fuse, and the root cause is a low-voltage short that has to be traced.

What You'll Notice

• The furnace is completely unresponsive to a call for heat and the display shows EE5
• No inducer, igniter, or blower activity at all during a heat call
• A new fuse blows again quickly if the short has not been repaired
• The problem sometimes begins right after thermostat wiring, a new accessory, or service work near the furnace
• A communicating ComfortNet thermostat may lose power or drop communication because it rides on the same 24V circuit

Common Causes

How This Is Diagnosed

A technician confirms the on-board 3-amp fuse is open, then isolates whether the short is internal or external. A common approach is to disconnect the thermostat and accessory wiring and check whether a replacement fuse survives with those loads removed; if it does, the fault is downstream in the field wiring, and if it still opens, the short is inside the furnace at a chafed harness, pinched conductor, or failed component.

Once the short is located and corrected, the manual specifies replacing the fuse with a 3-amp automotive-type fuse. The voltage checks, wiring repair, and fuse replacement are professional work; a homeowner should not repeatedly install fuses in an attempt to keep the furnace running.

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 replacement fuse blows again shortly after installation
• The code appeared right after thermostat, humidifier, or other low-voltage wiring was changed
• You see damaged, pinched, or burned low-voltage wiring near the furnace or thermostat
• You cannot confidently locate and repair a wiring short yourself

✓ Verified against manufacturer service manual — March 2026