Amana AMVC960803BN Error Code EEd: Auxiliary Limit Switch Open

What Does Code EEd Mean?

The AMVC960803BN carries a second overheat safety, the auxiliary limit switch, mounted in the blower compartment rather than at the heat exchanger. When the blower area gets hotter than it should, that switch opens and the Integrated Control Module posts EEd and stops the burners. The manual also notes that losing 115V power during an active heat cycle — so the blower can't run to carry residual heat away — can trip this same switch.

As with the primary high limit, the root problem is almost always insufficient conditioned air moving through the furnace: a dirty filter, closed or blocked registers, restrictive ductwork, a blower running too slow, or a weak blower motor. Because the switch sits in the blower compartment, anything that slows or interrupts the circulator blower is especially relevant here.

It is worth distinguishing EEd from its sibling EE3. EE3 is the primary high-limit switch reading the heat exchanger, while EEd is the auxiliary limit watching the blower compartment; seeing both together points strongly at a whole-system airflow shortage. The only homeowner-safe cause is a restricted filter or blocked vents, so the DIY steps stay there and leave blower-motor and ductwork diagnosis to a technician.

What You'll Notice

• The furnace fires briefly, then shuts the burners off on overheat
• The 7-segment display shows EEd
• Weak or no warm airflow from the supply registers
• The filter is dirty, or many registers are closed or blocked
• You may also see EE3 (primary high limit) at the same time

Common Causes

How This Is Diagnosed

Diagnosis starts at the airflow path: the filter is checked and replaced if dirty, and every supply and return grille is confirmed open. If overheating continues with good airflow, a technician measures temperature rise and static pressure, inspects the ductwork, and verifies the blower reaches its correct programmed speed. They also confirm the furnace did not simply lose power mid-cycle. Only after airflow and blower operation check out is the auxiliary limit switch and its wiring tested for a stuck-open contact.

How to Fix It: Restore Airflow by Checking the Filter

What You'll Need

• New furnace air filter (correct size) 🛒 Find at FiltersFast · 🛒 Find at Amazon
• Flashlight

Steps

1. Turn off power at the breaker or furnace switch and shut off the gas supply Switch the furnace breaker (or disconnect switch) to OFF and turn the manual gas shutoff valve to the closed position (handle perpendicular to the pipe). If you smell gas at any time, leave immediately and call your gas company from outside.
2. Remove and inspect the air filter Find the filter in the return duct or the furnace filter slot and hold it up to a light. If light will not pass through, or it is gray and matted, it is choking the airflow the blower needs to shed heat.
3. Install a clean, correctly sized filter Slide in a new filter of the same dimensions with the airflow arrow pointing toward the furnace. Avoid extremely dense filters the blower cannot draw through.
4. Open and unblock all vents and returns Confirm supply registers throughout the house are open and clear of furniture or rugs, and that return grilles are unobstructed. Too many closed rooms starves the blower.
5. Restore gas and power, then allow it to reset Reseat the panel, open the gas valve (handle parallel to the pipe), switch the breaker back ON, and give the furnace a few minutes to cool so the auxiliary limit can reset. Set the thermostat to call for heat.

When to Call a Professional

Contact a licensed HVAC technician if:

• EEd returns after the filter is replaced and all vents are open
• The blower makes grinding, squealing, or humming sounds, or will not spin
• Airflow feels weak even with a clean filter
• The furnace short-cycles on overheat every few minutes
• EEd appears together with EE3

✓ Verified against manufacturer service manual — March 2026