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Midea · Furnace troubleshooting

No light and no fan - furnace does not start

What is going on

Furnace shows no LED activity and the blower does not run on a call for heat or fan.

Likely causes

  • No 115 V power to the furnace
  • Blower door switch open or door not closed
  • Blown fuse
  • Failed transformer
  • Thermostat not sending a call
  • Loose/wrong wiring
  • Blower motor or fan drive board failure
  • Control board failure

Check in this order

  1. Warning: Discharge static before touching the control board; disconnect power before handling wiring.
  2. Check for 115 VAC between L1 and common at the furnace; if missing, check the supply at the connection box/disconnect.
  3. Make sure the blower access door is closed properly; with power off, press in the door switch and confirm 0 ohms. Replace the door switch if open.
  4. Check the board fuse; replace if blown. If the fuse is good, check the transformer secondary for 18-31 VAC and replace the transformer if it is dead.
  5. Check for 18-31 VAC between R and C; then check W/W1 to C (heating call) and G to C (fan call). No call = check thermostat settings or replace the thermostat.
  6. Check for loose wires or wrong connections and correct per the wiring diagram; leave the PARK terminal unused.
  7. If the board receives the call but nothing happens, check for 18-31 VAC between the speed tap (hi-heat/lo-heat/hi-cool/lo-cool) and COM and 115 VAC between CIRC-H and N. Replace the board if outputs are missing.
  8. If the motor gets signal and power but does not turn, measure resistance between motor leads U, V and W (should be 2-10 ohms). If in range, replace the fan drive board; if not, replace the motor.

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

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Source: Midea 96% AFUE Gas Furnace (A2L) Troubleshooting Guide, Section 3.1 chart and Figs. 1-8, p.7-9. Written in our own words; check the manual for your exact model.

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.