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Table 2. Alert Codes and Troubleshooting
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in
the Installer alert button. Minor and Moderate alerts are found only in the Installer alert
button.
Alert
Code
Steps to clear
Alert Text
Priority
600
Critical
Compressor has been cycled OFF on
utility load shedding.
Load shedding function: Provides a method for a local utility company to limit
the maximum power level usage of the outdoor unit. The feature is activated by
applying 24 volts AC power to the L and C terminals on the outdoor control.
601
Critical
Outdoor unit has been cycled
OFF
on
low temperature protection.
Low temperature Protection: Outdoor unit will not operate when the outdoor
temperature is at or below 4°F (20°C). If the unit is operating and the outdoor
temperature drops below 4°F (20°C), the unit will continue to operate until the
room thermostat is satisfied or the outdoor temperature drops to 15°F (26°C).
(Outdoor unit ambient sensor provides temperature readings).
700
Moderate
(Thermostat) The temperature sensor
in the thermostat is not working prop
erly.
Recalibrate thermostat to clear. Replace thermostat if needed.
701
Moderate
(Thermostat) The thermostat is read
ing indoor temperatures above the
preprogrammed limit.
Recalibrate thermostat to clear; cool thermostat; adjust setpoint. Replace ther
mostat, if needed.
702
Moderate
(Thermostat) The thermostat is read
ing indoor temperatures below the
preprogrammed limit.
Recalibrate thermostat to clear; warm thermostat; adjust setpoint. Replace
thermostat, if needed.
703
Moderate
(Thermostat) The humidity sensor in
the thermostat is not working properly.
Recalibrate thermostat to clear; adjust setpoint. Replace thermostat, if needed.
704
Moderate
(Thermostat) The thermostat is read
ing indoor humidity levels above the
preprogrammed limit.
Recalibrate thermostat to clear. Replace thermostat, if needed.
705
Moderate
(Thermostat) The thermostat is read
ing indoor humidity levels below the
preprogrammed limit.
Recalibrate thermostat to clear. Replace thermostat, if needed.
Ohm
Check
—
The ohm reading in the system is
either too high or too low.
Ohm reading between i+ and i anywhere on the RSBus with supply power off
should be between 70 and 90 ohms. If above 90 ohms, check and repair wir
ing, splices or other wiring defects that may be causing the excessive resist
ance. If less than 70 ohms, check for shorted wires.