Goodman

E6

Protect

Low flame signal

Flame is present but the micro-amp signal is below the IFC threshold.

9 plates — walk the one on the cabinet

First check

1 Measure µA while it is running

Do not clean first and guess. Series-µA the rod on Goodman GMEC96 during a call. Falling µA is oxide, ground, or a dying flame. A hard drop is often the pressure switch or limit opening, not the rod. Clean rod, chassis ground, manifold / LP conversion.

Expect: Typically ≥ 1.0 µA DC on this family — confirm the door card. Rising while running.

The rest of the walkthrough is Diagnose.

On the plates

Clean rod with a non-scratch pad — not sandpaper.
Chassis ground to burner box and IFC.
Manifold pressure / orifice / LP conversion.
Clean rod with a non-scratch pad.
Manifold / orifice / LP conversion.
Clean rod, chassis ground, manifold / LP conversion.
Clean rod, burner-box ground. µA should rise as rate climbs; flat µA at every percent is rod/ground, not the valve.
Light-off rate too lean (valve / orifice / LP). Do not crank a two-stage manifold chart onto this modulator.

Plates that use E6

Same number, other makers

E6 on Goodman is not the same code on these plates.