E6 Low flame signal

What the control is telling you

The furnace still runs, but the flame sensor current is low. If it gets worse the furnace will start locking out. ComfortNet thermostat shows WEAK FLAME E6.

Applies to: GMVC95/AMVC95 upflow and *CVC9 counterflow two-stage furnaces

Likely causes

• Coated or oxidized flame sensor
• Sensor not sitting in the flame
• Lazy flame from wrong gas pressure or poor combustion air

Test and repair steps

1. Safety turn power off before working on the control or wiring.
2. Clean the flame sensor with emery cloth.
3. Check the sensor sits in the burner flame.
4. Check the intake pipe for blockage, length, elbows and termination.
5. Check gas pressure against the rating plate and adjust if needed (gas tech only).

Settings for these units

• Normal status displays (7-segment) · Goodman/Amana GM9S96/AM9S96
• Normal status displays (7-segment) · Goodman/Amana GM9S80/AM9S80
• Normal status displays (7-segment) · Goodman/Amana GM9C96/AM9C96
• Minimum recommended filter size · Goodman/Amana GM9C96/AM9C96

Models that show this code

10 models in Goodman/Amana *MVC95/*CVC9 two-stage ComfortNet

Other codes on the same units

• E1 Low-stage pressure switch closed at start of heat
• E2 Low-stage pressure switch will not close
• E3 High limit or rollout limit open
• E4 Flame sensed with no call for heat
• E5 Control fuse open
• E7 Igniter circuit fault
• E8 High-stage pressure switch closed at start of heat
• E9 High-stage pressure switch will not close