EEH Twinning error

What the control is telling you

The twinning feature (two furnaces linked through the TWIN terminal) is not working.

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

• Twin wiring loose or wrong
• Furnaces not the same model or set differently
• Furnaces powered from opposite panel legs
• Control board fault

Test and repair steps

1. Check the TWIN terminal wiring between the two furnaces and the thermostat wiring per the twinning diagram.
2. Both furnaces must be the same model with the same staging and speed tap settings.
3. Each furnace needs its own 115 VAC supply, with L1 on the same panel leg: L1 to L1 between the furnaces must read 0 V.
4. If the wiring and settings are correct, replace the integrated control board.

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

• EE9 High-stage pressure switch did not close
• EEA Reversed line polarity or grounding error
• EEC Internal gas valve error - valve energized when it should not be
• EEE Internal control fault (IRQ loss)
• EEJ Inducer relay error
• EEL Igniter relay / igniter circuit fault
• EEb External gas valve error - valve not energized when it should be
• EEn Igniter open