Lennox Error Code 32: Device resetting (Air Handler)

Updated October 13, 2026 · by Aurora Star Tech Inc.

Lennox error code 32 on a air handler means: Device resetting. It is also called Lennox diagnostic code 32.

Low severityAir Handler

Homeowner? What Lennox code 32 means for you

Usually minor Your air handler is reporting: Device resetting. This code is usually informational or minor. The safe checks below often clear it; call us if it keeps showing up.

Safe things you can check yourself

Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
Make sure the unit has power: its on/off switch (often looks like a light switch near the unit) is ON and the breaker in the electrical panel is not tripped.
Look at the air filter. If it is grey and clogged, replace it; a blocked filter causes many shutdowns.
Try one reset: turn the power off for 30 seconds, then back on. If the code comes back, stop resetting and call a technician.

Call (647) 657-2977 Book a service call

Licensed technicians serving Vaughan, Toronto and the GTA.

What does Lennox error code 32 mean?

A component is resetting itself, often during a power outage or fluctuation (information for dealer only). S30/S40 thermostat alert code 32.

Applies to: Lennox communicating air handlers and EIM-equipped indoor units in S30/S40 smart thermostat systems

Common causes of Lennox code 32

Power fluctuation
Overloaded transformer
Low 24 VAC at device

A technician checks these and 1 other possible causes on site before replacing any part.

Safety: Gas, electrical and refrigerant work must be done by a licensed technician. Turn off power and gas before servicing, never bypass a safety control, and always follow the manufacturer's manual for your exact model.

Other Lennox Air Handler codes

Code	Meaning
13	Duplicate comfort sensor ID
14	Too many devices of the same type
15	Parameter mismatch detected
20	Protocol upgrade required
21	Incompatible equipment detected
31	Lost communication with device
34	Must program unit capacity for device
35	Incorrect operation of device
36	Heating when not requested
37	Cooling when not requested
38	Not heating when requested
39	No cooling when requested

All Lennox Air Handler error codes →

Lennox code 32: homeowner questions

What does Lennox code 32 mean?

Device resetting. A component is resetting itself, often during a power outage or fluctuation (information for dealer only). S30/S40 thermostat alert code 32.

Is it safe to keep using my air handler with code 32?

Usually yes. Code 32 is normally minor, but if it keeps coming back have it checked.

Can I reset Lennox code 32 myself?

You can try one reset (power off for 30 seconds, then on). If Lennox code 32 comes back, the cause is still there and a licensed technician should check it.

Who can fix Lennox code 32 near me?

Aurora Star Tech Inc. repairs Lennox air handlers in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.

Troubleshooting guides

Two horizontal lines on display (soft disable) - Lennox communicating Lennox · Air Handler

Source: Lennox Residential Communicating Systems Alert Code Guide (V2) 100017 (3/2023), Table 2 Alert Codes and Troubleshooting, p.10. 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.