Amana AMVC960803BN Error Code Eb4: Blower Motor Current Trip or Lost Rotor

What Does Code Eb4 Mean?

Error code Eb4 on the Amana AMVC960803BN indicates that the circulator blower motor has sensed either a high current draw or a loss of rotor control. The motor has shut down to protect itself from damage, and the furnace will not operate until the condition is resolved.

The ECM blower motor monitors its own current and rotor position during operation. When the motor encounters a sudden increase in resistance — such as a severely blocked filter, an object caught in the blower wheel, or a sudden blockage of the air inlet or outlet — the current spikes and the motor trips its internal protection. A loss of rotor control can also occur if the motor bearings are beginning to fail or if there is a mechanical obstruction preventing smooth rotation.

Unlike the Eb3 code (which indicates a gradual limiting condition), Eb4 represents a more abrupt event. The motor detected a condition serious enough that it could not simply reduce speed — it had to stop entirely. In many cases, this is triggered by a severely restricted air filter that has been neglected for an extended period.

Common Causes

How to Fix It: Check Air Filter and Clear Obstructions

What You'll Need

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

Steps

1. Turn off electrical power and gas supply Locate the furnace circuit breaker and flip it to OFF. Turn the gas shutoff valve to the OFF position (perpendicular to the pipe). If you smell gas at any point, leave immediately and call your gas company.
2. Check and replace the air filter Remove the air filter from the blower compartment or filter rack. A severely clogged filter is the most common cause of Eb4. Replace it with a new filter of the correct size, with the airflow arrow pointing toward the blower.
3. Inspect the air inlet and outlet for obstructions Look around the furnace for anything that might be blocking the return air inlet or supply air outlet. Items stored too close to the furnace, collapsed ductwork, or debris inside the blower compartment can all cause sudden airflow blockages.
4. Check all supply vents and return air registers Walk through your home and ensure all supply vents and return air grilles are open. If someone recently closed multiple registers (for example, in unused rooms), this could have caused the airflow restriction that triggered Eb4.
5. Restore power and gas, then test Replace the access panel, turn the gas supply valve to ON, and flip the circuit breaker to ON. The motor should reset after power is restored. Set your thermostat to call for heat and listen for the blower motor to start smoothly.

When to Call a Professional

Contact a licensed HVAC technician if:

• Eb4 returns after replacing the filter and clearing all obstructions
• The blower motor makes grinding, clicking, or scraping noises
• The blower motor does not start at all when the furnace calls for heat
• You can see or hear something physically contacting the blower wheel
• The motor starts but shuts down again within seconds

✓ Verified against manufacturer service manual — March 2026