FL Low flame signal

What the control is telling you

The control is seeing a weak flame signal. The furnace may still run but is at risk of flame dropouts (E8).

Applies to: Midea BGH96M 96% AFUE two-stage gas furnaces (060B3A, 080B3A, 080C4A, 100C5A, 100D5A, 120D5A)

Likely causes

• Dirty or broken flame sensor
• Poor control board ground
• Manifold or inlet gas pressure out of range
• Blocked burner orifices
• Faulty gas valve or control board

Test and repair steps

1. Warning: Gas appliance - leak check with soap solution only.
2. Clean the flame sensor with steel wool or replace it if broken.
3. Check the control board / green ground wire is properly grounded.
4. Check inlet gas pressure natural gas 4.5-10.5 in. WC, propane 11.0-13.0 in. WC; correct the supply if out of range.
5. Check manifold pressure 3.5 in. WC natural gas, 10 in. WC propane; adjust the gas valve, and replace it if it cannot be adjusted.
6. Inspect burners for blocked or clogged orifices and clear them.
7. If all checks are good and FL persists, replace the control board.

Models that show this code

6 models in Midea 96% AFUE A2L Gas Furnace (BGH96M)

Other codes on the same units

• E6 Limit/rollout switch open more than 5 minutes
• E7 System lockout - failed ignition
• E8 System lockout - too many flame dropouts
• LED2 green 1 flash Refrigerant leak sensor communication failure
• LED2 green 2 flashes Refrigerant concentration above alarm limit (leak)
• LED2 green 3 flashes Sensor connected but SW1-2 OFF (DIP reminder)
• LED2 green 4 flashes Refrigerant sensor expired or faulty
• Pr Incorrect polarity of L1/L2