Amana AMVM970803BN Error Code Eb3: Circulator Blower Motor Limiting

What Does Code Eb3 Mean?

Error code Eb3 on the Amana AMVM970803BN indicates that the circulator blower motor is operating in a power, temperature, or speed limiting condition. The motor's built-in electronics have detected that it is working harder than normal to push air through the system, so it has throttled back to protect itself from damage.

This means your furnace is still running, but at reduced performance. You may notice weaker airflow from the supply vents or that your home is not reaching the set temperature as quickly as usual. The variable-speed ECM motor in this furnace is designed to ramp up and down to meet airflow demands, and Eb3 appears when the motor cannot deliver the airflow the control module is requesting.

The most common cause is a dirty or clogged air filter restricting airflow through the system. Closed or blocked supply registers and return grilles can also force the motor to work harder. Less commonly, undersized or poorly designed ductwork creates a permanent restriction that the motor cannot overcome.

Common Causes

How to Fix It: Replace the Air Filter and Clear Airflow Restrictions

What You'll Need

• Replacement air filter (correct size for your system) 🛒 Find at FiltersFast · 🛒 Find at Amazon
• Flashlight

Steps

1. Turn off power at the breaker or furnace switch and shut off the gas supply valve Locate the furnace circuit breaker and flip it to OFF, or turn off the furnace power switch. Turn the gas shutoff valve to the OFF position (perpendicular to the pipe). If you smell gas, leave immediately and call your gas company.
2. Check and replace the air filter Remove the air filter from the return air duct or furnace filter slot. If it is visibly dirty, gray, or has not been changed in over 3 months, replace it with a new filter of the correct size. Make sure the airflow direction arrow on the new filter points toward the furnace.
3. Verify all supply and return vents are open Walk through every room and ensure all supply registers and return grilles are fully open and not blocked by furniture, curtains, rugs, or other objects. Even a few closed vents can significantly restrict airflow in a modulating furnace system.
4. Inspect the blower compartment With the power off, remove the lower access panel and use a flashlight to check the blower wheel for excessive dust buildup. A heavily caked blower wheel reduces airflow capacity. Also check that nothing has fallen into the blower compartment.
5. Restore power and gas, then test Turn the gas supply valve to ON (parallel to the pipe). Restore electrical power at the breaker or furnace switch. Set your thermostat to call for heat and monitor the furnace. The Eb3 code should clear once the motor can operate within normal parameters.

When to Call a Professional

Contact a licensed HVAC technician if:

• Eb3 persists after replacing the filter and opening all vents
• The blower motor makes unusual humming, grinding, or clicking noises
• Airflow from supply vents remains noticeably weak
• You suspect your ductwork may be undersized for the system
• The blower wheel has heavy dust buildup that you cannot safely clean

✓ Verified against manufacturer service manual — March 2026