Lennox Furnace: Blower motor does not run – Lennox SL280UHV ECM checks
Blower motor does not run - Lennox SL280UHV ECM checks on a Lennox furnace: Variable-speed blower does not run; winding checks from the SL280UHNV service manual.
Applies to: Lennox SL280UHV (SL280UH070V36A, 090V36B, 090V48B, 090V60C, 110V60C, 135V60D) and SL280UHNV (SL280UH060NV36A, 080NV48B, 080NV60C, 100NV60C) 80% two-stage variable-speed communicating furnaces
Common causes of blower motor does not run - lennox sl280uhv ecm checks
- Damaged motor windings
- Motor/control module failure
- Harness or control problem
How to fix blower motor does not run - lennox sl280uhv ecm checks: step by step
- WARNING: Disconnect power before testing.
- Check the control display for E201, E202, E292 or E295 and follow that code.
- Test A: measure resistance from each of the three motor leads (3-pin plug) to the unpainted end shield. Below 100k ohms = replace motor and control module; above 100k = go to Test B.
- Use an ohmmeter on the highest scale (100k or more) if not auto-ranging.
- Test B: measure lead-to-lead resistance on the 3-pin plug; each pair must be under 20 ohms and all pairs equal. Over 20 ohms = replace motor and control module.
If the unit shows an error code, look it up: Lennox Furnace codes
Models
Lennox EL195UHNE
EL195UH040NE36BEL195UH060NE36BEL195UH080NE48CEL195UH100NE60C
EL296UHV
EL296UH045XV36BEL296UH070XV36BEL296UH090XV36CEL296UH090XV48CEL296UH090XV60CEL296UH110XV48CEL296UH110XV60CEL296UH135XV60D
Lennox ML180UHE
ML180UH045E36AKML180UH045XE36AKML180UH070E36AKML180UH070E36BKML180UH070XE36AKML180UH070XE36BKML180UH090E48BKML180UH090E60CKML180UH090XE48BKML180UH110E60CKML180UH110XE60CKML180UH135E60DK
Lennox SL280UHV
SL280UH060NV36ASL280UH070V36ASL280UH080NV48BSL280UH080NV60CSL280UH090V36BSL280UH090V48BSL280UH090V60CSL280UH100NV60CSL280UH110V60CSL280UH135V60D
Lennox SL297NV
SL297UH040NV36BSL297UH060NV36BSL297UH080NV48CSL297UH080NV60C
Source: Lennox SL280UHNV Unit Information Corp 1601-L8 (rev 04/2024), Troubleshooting Motor Windings, Table 14 and Figures 11-12, p.28. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.