EEC Internal gas valve error - valve energized when it should not be

What the control is telling you

The control sees voltage at the gas valve with no call for heat. Flowcharts call this code EC. Note: the wiring diagram legend labels this code 'External Gas Valve Error' while the troubleshooting chart and flowchart say internal - follow the chart.

Applies to: Goodman/Amana/GMC gas furnaces, 9-speed ECM, 7-segment control. Two-stage 96%: AC9C96, AM9C96, GC9C96, GM9C96. Single stage 80%: VC9S80, VM9S80, AC9S80, AM9S80, GC9S80, GM9S80. Single stage 92/96%: VC9S96, VM9S96, AC9S96, AM9S96, AM9S92, GC9S96, GM9S96, GM9S92

Likely causes

• Gas valve relay on the control board stuck closed
• Miswiring that feeds the gas valve circuit
• Gas valve shorted to ground or loose connection

Test and repair steps

1. Warning: a valve powered with no call for heat is a safety hazard - shut off the manual gas valve until repaired.
2. Check the gas valve wiring for miswiring and correct it.
3. With no call for heat, check for voltage at the gas valve. Voltage present = board relay stuck closed; replace the integrated control board.
4. Remove the valve wires and check them for voltage; if present, check the valve for a short to ground or loose connection and repair or replace the valve.

Settings for these units

Normal status displays (7-segment) · Goodman/Amana GM9S96/AM9S96

These are normal operating displays, not fault codes.

Normal status displays (7-segment) · Goodman/Amana GM9S80/AM9S80

These are normal operating displays, not fault codes.

• Normal status displays (7-segment) · Goodman/Amana GM9C96/AM9C96
• Minimum recommended filter size · Goodman/Amana GM9C96/AM9C96

Models that show this code

80 models in Goodman/Amana GM9S96/AM9S96, Goodman/Amana GM9S80/AM9S80, Goodman/Amana GM9C96/AM9C96

Other codes on the same units

• EE6 Low flame signal
• EE8 High-stage pressure switch closed at start of heating cycle
• EE9 High-stage pressure switch did not close
• EEA Reversed line polarity or grounding error
• EEE Internal control fault (IRQ loss)
• EEH Twinning error
• EEJ Inducer relay error
• EEL Igniter relay / igniter circuit fault