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Indoor blower does not run - Lennox EL195UHNE

What is going on

Constant-torque ECM blower motor check on the EL195UHNE. The motor needs 120 VAC on J48 and 24 VAC (12-33 VAC) on one speed tap of J49.

Likely causes

  • No 120 V at the motor
  • No 24 V on the active speed tap
  • Harness fault
  • Failed motor or motor module

Check in this order

  1. Warning: Shut off power before unplugging J48/J49.
  2. Test 1 power on, check 120 VAC across L and N (or 7A and 9A) of J48; if missing check L1 to Neutrals on the control.
  3. Test 2 thermostat on continuous fan, check 24 VAC between C of J48 (or pin 6A on 6-pin plugs) and the fan tap on J49; if missing check 24 COM to the active tap on the control.
  4. Both voltages present and motor not running right: replace the motor, or the module only on motors with 4-pin power and 5-pin signal plugs.
  5. Before fitting a new module each motor pin to end plate more than 100k ohms, three windings equal within about 1 ohm, and the wheel spins freely.
  6. Torque module bolts to 22 in-lb; connectors face down for a drip loop.

Applies to: EL195UHNE

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Source: Lennox EL195UHNE Unit Information Corp 1801-L1 (rev 04/2024), C - Blower Compartment, Figures 10-17, p.15-17. 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.