Goodman GMVM970803BN Error Code E0: Lockout
What Does Code E0 Mean?
An E0 Lockout code on the Goodman GMVM970803BN means the furnace attempted the full ignition sequence — energizing the inducer motor, confirming pressure switch closure, activating the hot surface igniter, and opening the gas valve — and failed to establish or maintain a stable flame on all three consecutive attempts. After the third failure in a single call for heat, the integrated control module enters safety lockout and displays E0.
The most common reasons for repeated ignition failure include a dirty or cracked hot surface igniter that cannot reach proper temperature, a flame sensor coated with oxidation or carbon buildup that fails to detect the flame even when it is present, or a gas supply issue such as a closed manual shutoff valve. Pressure switch problems — where the switch is stuck open and prevents the sequence from proceeding — can also cause repeated ignition failures. Less common causes include improperly sized gas orifices or a weak induced draft blower that cannot maintain proper venting pressure.
The lockout will automatically reset after one hour, allowing the furnace to attempt operation again. You can also manually reset by turning off the furnace power switch briefly or lowering the thermostat below room temperature for 1–20 seconds. However, if the root cause has not been corrected, the furnace will simply lock out again after three more failed attempts. Recurring E0 codes require a technician to diagnose and repair the specific failure point.
Common Causes
When to Call a Professional
Contact a licensed HVAC technician if:
- If the E0 code returns after the one-hour automatic reset, call a technician to inspect the hot surface igniter, flame sensor, gas valve operation, and venting system
- A technician should check for closed gas shutoffs, measure gas manifold pressure, clean or replace the flame sensor, and test the igniter — do not attempt gas system work yourself
✓ Verified against manufacturer service manual — March 2026