Goodman GMEC960803BN Error Code Red 10 Flashes: Gas Flow With No Call for Heat
What Does Code Red 10 Flashes Mean?
Ten red flashes on the Goodman GMEC960803BN's Integrated Control Module mean the board sensed current flowing to the gas valve when no heat was being called for. The gas valve should only be energized during a controlled ignition sequence, so unexpected valve current tells the board that gas could be commanded on outside its control.
The manual's guidance is to verify the gas valve is not receiving voltage from an electrical short; if the valve wiring is correct, the control board itself is replaced. In other words, either a wiring short is back-feeding voltage to the gas valve, or the board's valve-driver circuit has failed and is sending current when it should not. Both can allow uncontrolled gas flow, which is why this is a high-severity safety fault.
Unlike red 1 flash (a flame sensed when none should be present), red 10 is about electrical current reaching the gas valve itself with no heat call. Both are gas-safety faults where the safe response is to stop gas flow and get a professional. This is not homeowner-repairable — do not attempt gas valve or board work.
What You'll Notice
- The furnace will not run normally and the board flashes red ten times
- You may smell gas near the furnace if the valve is being energized
- The fault can appear with no thermostat call for heat
- The furnace refuses to begin or complete a normal cycle
- The code persists rather than clearing on its own
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Electrical short sending voltage to gas valve | Most common | ✗ Call a pro → |
| Faulty control board | Common | ✗ Call a pro → |
How This Is Diagnosed
Because unexpected gas-valve current can mean uncontrolled gas, the gas supply is shut off before investigation. A technician then checks the gas-valve wiring for a short or stray voltage that could energize the valve outside the ignition sequence. If the wiring is correct and the board is still driving the valve without a call, the control board's valve-driver has failed and the board is replaced. Gas valve and control-board work are strictly professional repairs.
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 board shows ten red flashes at all — this gas-valve fault should always be professionally diagnosed
- You smell gas near the furnace
- The code appears with no call for heat
- Any diagnosis involving the gas valve, its wiring, or the control board
Frequently Asked Questions
Is ten red flashes a safety problem?
Yes. It means the board sensed current reaching the gas valve with no call for heat, which can allow uncontrolled gas. Shut off the gas supply and have a technician diagnose it before running the furnace.
Does this always mean the control board is bad?
Not always. The manual says to first rule out a wiring short back-feeding the gas valve. If the wiring is correct, then the control board is replaced. Either way it is a professional diagnosis.
✓ Verified against manufacturer service manual — March 2026