Goodman GMVC960803BN Error Code EE0: Lockout Due to Excessive Retries or Recycles

What Does Code EE0 Mean?

The integrated control module on this two-stage GMVC96 furnace runs a fixed ignition sequence every heat call: it energizes the hot-surface igniter, opens the gas valve, and then looks for a steady flame-rectification (micro-amp) signal through the flame sensor. If a stable flame is not confirmed, the board shuts the gas, purges, and tries again. After three consecutive failed retries the control stops trying and posts EE0 on the 7-segment LED display, holding the furnace in lockout so it will not keep dumping unburned gas into the heat exchanger.

Because EE0 is the end state of the ignition sequence rather than a single component fault, its cause can sit anywhere in that chain. On this model the most common trigger is a dirty or oxidized flame sensor that can no longer pass enough micro-amp current for the board to accept the flame as "proven," so the control times out and recycles. Other frequent causes are no gas reaching the burners, a weak or aged hot-surface igniter, and orifice or igniter alignment problems.

EE0 rarely appears without warning on the GMVC96. The same weakening flame signal that eventually causes a lockout usually shows up first as EE6 (low flame signal), a low-severity code the board posts while the furnace is still running normally. Treat EE6 as the early-warning precursor: if it is ignored, the signal keeps drifting down until an ignition can no longer be proven and the retries roll over into an EE0 lockout. Cleaning the flame sensor is routine maintenance a technician performs during a service call — it involves working around the live burner and gas train, so it is not a homeowner DIY task on this pro-only code.

What You'll Notice

• The 7-segment diagnostic display shows EE0 and the furnace will not run
• You hear the igniter glow and the inducer spin, sometimes a brief puff of ignition, but the burners drop out and the sequence repeats a few times before stopping
• No heat from the vents even though the thermostat is calling for heat
• The furnace goes quiet and stays locked out until it is reset or times out
• In the days before the lockout you may have noticed the furnace occasionally short-cycling or an EE6 low-flame-signal code

Common Causes

How This Is Diagnosed

A technician first confirms whether flame is actually being established: if the burners light but the board still fails to prove flame, attention goes to the flame sensor and its micro-amp reading, which is the most common EE0 cause on this furnace. If the burners never light, the tech works upstream — verifying gas supply and manifold pressure, inspecting the hot-surface igniter for cracks or high resistance, and checking igniter position and burner alignment.

Because the front-cover pressure switch and orifices sit in the same ignition path, those are checked when flame is intermittent or absent. The technician typically clears the lockout, watches a full ignition cycle, and measures the flame-sense signal to distinguish a sensor problem from a gas-delivery or igniter problem.

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 EE0 code returns after you reset the thermostat and let the furnace attempt ignition again
• You can smell gas near the furnace, or you hear repeated ignition puffs without a sustained flame
• The furnace had been posting EE6 (low flame signal) before it locked out
• The burners light briefly and then drop out on every cycle
• The furnace has no gas at the burners even though other gas appliances in the home work

✓ Verified against manufacturer service manual — March 2026