Goodman Error Code Lrn: Restart indoor-outdoor communication (Air Handler)

Updated October 15, 2026 · by Aurora Star Tech Inc.

Goodman error code Lrn on a air handler means: Restart indoor-outdoor communication. It is also called Goodman diagnostic code Lrn.

Low severityAir HandlerGoodman/Amana ComfortBridge AVPTC/MBVC

Homeowner? What Goodman code Lrn means for you

Usually minor Your air handler is reporting: Restart indoor-outdoor communication. 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 Goodman error code Lrn mean?

Menu action that restarts communication between the indoor and outdoor units.

Applies to: AVPTC / MBVC ComfortBridge air handlers

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.

Goodman models that use code Lrn

Show all 21 models

AVPTC25B14 AVPTC29B14 AVPTC31C14 AVPTC31C14AD AVPTC33C14 AVPTC35B14 AVPTC37B14 AVPTC37C14 AVPTC37D14 AVPTC39C14 AVPTC49C14 AVPTC49D14 AVPTC59C14 AVPTC59D14 AVPTC61D14 AVPTC183014 AVPTC313714 AVPTC426014 MBVC1201 MBVC1601 MBVC2001

Other Goodman Air Handler codes

Code	Meaning
HP2	Compressor heat, high stage (comm)
Ht	Electric heat, single stage
Ht1	Electric heat (Ht1)
Ht2	Electric heat, high stage
Idl	Idle - no call
L6F	Fault recall (furnace-type menu)
RDS 2 flashes	Control board internal fault (leak detection board)
RDS 3 flashes	R32 sensor communication fault
RDS 4 flashes	R32 sensor internal fault
RDS fast flash	R-32 leak alarm (or system verification test)
RDS slow flash	Normal operation - leak detection OK
RDS steady on	Delay mode after leak alarm or fault

All Goodman Air Handler error codes →

Goodman code Lrn: homeowner questions

What does Goodman code Lrn mean?

Restart indoor-outdoor communication. Menu action that restarts communication between the indoor and outdoor units.

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

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

Can I reset Goodman code Lrn myself?

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

Who can fix Goodman code Lrn near me?

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

Troubleshooting guides

Blower not running - R-32 AMST/AWSF EEM air handler Goodman · Air Handler
No electric heat - R-32 air handler heat kit Goodman · Air Handler
Outdoor unit not communicating - ComfortBridge AVPTC/MBVC Goodman · Air Handler
Restart indoor-outdoor communication (Lrn) Goodman · Air Handler
Run the R-32 leak alarm test (RDS test mode) Goodman · Air Handler
View and clear the 6 most recent faults (FCL / L6F) Goodman · Air Handler

Source: Goodman ComfortNet ASXC-DSXC-GSXC / ASZC-DSZC-GSZC / AVPTC-MBVC service, Air Handler Display (B*) menu table pp.61-62 and Menu Navigation p.64. 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.