Installation and Maintenance Manual

ECM Overview and Setup
62 UNT-SVX07D-EN
Error Codes
Displayed during
abnormal operation.

Indicates a locked rotor condition of Motor 1. The motor will be locked
out until the cause has been resolved, and the power cycled; refer to
“Troubleshooting (ECM),” p. 126 for resolution details.
Motor 2 will continue to operate, but will not be monitored. Fan Status
function, if being used, will report an inoperative motor. Electric heat
and changeover heat will be shut down.


Indicates a locked rotor condition of Motor 2. The motor will be locked
out until the cause has been resolved, and the power cycled; refer to
“Troubleshooting (ECM),” p. 126 for resolution details.
Motor 1 will continue to operate, but will not be monitored. Fan Status
function, if being used, will report an inoperative motor. Electric heat
and changeover heat will be shut down.


Indicates that Motor 1 has experienced a run-away or over speed
condition, and has been shutdown. The unit will offer limited “limp-in”
performance, and Motor 2 will continue to operate, but will not be
monitored. Fan Status function, if being used, will report an
inoperative motor.
Refer to “Troubleshooting (ECM),” p. 126: to reset, the cause must be
resolved and the power to the unit cycled. Electric heat and changeover
heat will be shut down.


Indicates that Motor 2 has experienced a run-away or over speed
condition, and has been shutdown. The unit will offer limited “limp-in”
performance, and Motor 1 will continue to operate, but will not be
monitored. Fan Status function, if being used, will report an
inoperative motor.
Refer to “Troubleshooting (ECM),” p. 126: to reset, the cause must be
resolved and the power to the unit cycled. Electric heat and changeover
heat will be shut down.


Indicates the motor is transitioning between speeds, ramping up or
down. The message “RAMP” is briefly displayed, followed by the
target speed for “Motor 1” only. Once the target speed has been
reached, the status display will resume operation.
→
→

On power on, the version of software is briefly displayed, followed by
the results of a POST (power on self test).
UNT-SVX07_-EN.book Page 62 Friday, April 27, 2012 9:40 AM