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Midea · Furnace

FL Low flame signal

Medium severity Midea 96% AFUE A2L Gas Furnace (BGH96M)

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.

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Source: Midea 96% AFUE Gas Furnace (A2L) Troubleshooting Guide, Section 3.7 FL chart, Tables 1-2, Fig. 12, p.21. Summarized in our own words; check the original manual for your model.

Homeowner looking at this code? See what it means for you and when to call a technician.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.