EE6 Low flame signal

What the control is telling you

The furnace runs normally but the flame-sense current is weak. If it keeps dropping the furnace will start losing flame and locking out.

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

• Flame sensor coated or oxidized
• Flame sensor not positioned correctly in the flame
• Lazy burner flame from wrong gas pressure or poor combustion air
• Poor ground

Test and repair steps

1. Put a DC microamp meter in series with the flame sensor wire and run a heat cycle: normal is 1 to 4 microamps.
2. Clean the flame sensor with steel wool (an invisible coating acts as an insulator) and check that it sits in the flame.
3. Check the burner flame it should be stable, soft and blue, not lifting or yellow.
4. Compare manifold and inlet gas pressure with the rating plate and adjust if needed.
5. Inspect the combustion air intake pipe is it blocked, and are its length, elbow count and termination correct?
6. Check high-resistance connections and grounding in the flame sense circuit.

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

• EE2 Pressure switch did not close (inducer runs, no ignition)
• EE3 High (primary) limit open
• EE4 Flame sensed with no call for heat
• EE5 Open fuse (short in low voltage wiring)
• 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
• EEC Internal gas valve error - valve energized when it should not be