Goodman Error Code EC1: Communication error with the outdoor unit (Air Handler)

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

Goodman error code EC1 on a air handler means: Communication error with the outdoor unit. It is also called Goodman diagnostic code EC1.

High severityAir HandlerGoodman/Amana ComfortBridge AVPTC/MBVC

Homeowner? What Goodman code EC1 means for you

Call a technician Your air handler is reporting: Communication error with the outdoor unit. The air handler has locked out or cannot run properly. One reset is fine; if the code comes back, it needs a licensed technician to find the cause.

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 EC1 mean?

The air handler lost communication with the outdoor unit; the outdoor unit does not run.

Applies to: ComfortBridge communicating air handlers AVPTC**14 (B* revision board) and MBVC1201/1601/2001 modular blowers

Common causes of Goodman code EC1

Wrong or poor low-voltage/communication wiring between indoor and outdoor units
Outdoor control lost power while running

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 EC1

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
Eb3	Blower limiting on power, temperature or speed
Eb4	Blower motor lost rotor control or high current
Eb5	Blower motor failed to start 10 times
Eb6	Blower shut down for voltage or power module temperature
Eb7	Blower motor missing shared data / failed to start 40 times
Eb9	Airflow lower than demanded
Ed0	No shared data on the network
Ed1	Invalid shared data
Ed4	Shared data rejected by the control
RDS 2 flashes	Control board internal fault (leak detection board)
RDS 3 flashes	R32 sensor communication fault
RDS 4 flashes	R32 sensor internal fault

All Goodman Air Handler error codes →

Goodman code EC1: homeowner questions

What does Goodman code EC1 mean?

Communication error with the outdoor unit. The air handler lost communication with the outdoor unit; the outdoor unit does not run.

Is it safe to keep using my air handler with code EC1?

It depends on the cause. The air handler has locked out or cannot run properly. One reset is fine; if the code comes back, it needs a licensed technician to find the cause.

Can I reset Goodman code EC1 myself?

You can try one reset (power off for 30 seconds, then on). If Goodman code EC1 comes back, the cause is still there and a licensed technician should check it.

Who can fix Goodman code EC1 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

Source: Goodman ComfortNet ASXC/GSXC/DSXC, ASZC/GSZC/DSZC, AVPTC/MBVC service manual, Air Handler Troubleshooting Matrix (B*) p.59-60. 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.