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Midea · Furnace

E7 System lockout - failed ignition

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

What the control is telling you

The furnace failed to prove flame on its ignition attempts and has locked out. Manual notes the control auto-resets after 1 hour. (Manual says lockout after three attempts in Section 2.2 but after two failed attempts in Appendix A2.)

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

Likely causes

  • Gas valve switched OFF or no gas supply
  • Low inlet or manifold gas pressure
  • Ignitor not glowing / cracked (out of 9-17 ohms)
  • No 115 V to ignitor or no 24 V to gas valve from board
  • Blocked burner orifices
  • Dirty or broken flame sensor / poor ground
  • Loose or wrong wiring
  • Faulty control board or gas valve

Test and repair steps

  1. Warning: Gas appliance - check for gas leaks with soap solution only, never an open flame.
  2. Make sure the gas valve switch is in the ON position.
  3. Check for loose or wrong wiring at the ignitor, gas valve and flame sensor; correct per the wiring diagram.
  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. Watch the ignitor during the 17 s preheat: it should glow red/orange. If not, check for 115 VAC between IG and IGN during preheat (no voltage = board problem) and measure the ignitor at 9-17 ohms (out of range = replace ignitor).
  6. If the ignitor glows but no flame, check for 18-31 VAC between M/HI and C at the gas valve; no signal = replace the control board.
  7. Check manifold pressure 3.5 in. WC natural gas, 10 in. WC propane. Adjust the valve; replace the gas valve if it cannot be adjusted. Check burner orifices for blockage.
  8. If flame lights then drops out confirm flame reaches the sensor, clean the sensor with steel wool or replace it, and confirm flame signal is 1-6 microamps.
  9. Check the green ground wire is properly connected; poor ground causes flame-sense failure.
  10. Reset the lockout (power off 1-20 s or remove thermostat call 1-20 s). If faults continue with all checks good, replace the control board.

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Source: Midea 96% AFUE Gas Furnace (A2L) Troubleshooting Guide, Section 3.2 E7/E8 chart, Figs. 9-12, Tables 1-2; Section 2.2, p.6, 10-11. Summarized in our own words; check the original manual for your model.

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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.