Goodman AMST***U1300AA Error Codes

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

Goodman AMST***U1300AA error codes and diagnostic codes (also listed as AMST60*U1300AA). The AMST***U1300AA is a Goodman air handler in the Goodman/Amana R-32 AMST/AWSF/ACSF air handlers series.

Homeowner with a air handler problem? Call (647) 657-2977 or book a service call — licensed technicians across Vaughan and the GTA.

Goodman AMST***U1300AA error codes list

Code	Meaning	Severity
RDS 2 flashes	Control board internal fault (leak detection board)	High
RDS 3 flashes	R32 sensor communication fault	High
RDS 4 flashes	R32 sensor internal fault	High
RDS fast flash	R-32 leak alarm (or system verification test)	Critical
RDS steady on	Delay mode after leak alarm or fault	Medium

Troubleshooting the AMST***U1300AA

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

All Goodman Air Handler error codes →

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.

Goodman AMST***U1300AA error codes list

Troubleshooting the AMST***U1300AA

Experience an Energy-Efficient Thermostat in Ajax Today