Lennox 11U61 Setup And Installation Manual page 34

Table 2. Alert Codes and Troubleshooting
Alert
Priority Alert Text
Code
Compressor has been cycled OFF on
600 Critical
utility load shedding.
Outdoor unit has been cycled OFF on
601 Critical
low temperature protection.
(Thermostat) The temperature sensor
in the thermostat is not working prop­
700 Moderate
erly.
(Thermostat) The thermostat is read­
ing indoor temperatures above the
701 Moderate
pre­programmed limit.
(Thermostat) The thermostat is read­
ing indoor temperatures below the
702 Moderate
pre­programmed limit.
(Thermostat) The humidity sensor in
703 Moderate
the thermostat is not working properly.
(Thermostat) The thermostat is read­
ing indoor humidity levels above the
704 Moderate
pre­programmed limit.
(Thermostat) The thermostat is read­
ing indoor humidity levels below the
705 Moderate
pre­programmed limit.
Ohm The ohm reading in the system is
—
Check either too high or too low.
507428-01
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.
Steps to clear
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.
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).
Recalibrate thermostat to clear. Replace thermostat if needed.
Recalibrate thermostat to clear; cool thermostat; adjust setpoint. Replace ther­
mostat, if needed.
Recalibrate thermostat to clear; warm thermostat; adjust setpoint. Replace
thermostat, if needed.
Recalibrate thermostat to clear; adjust setpoint. Replace thermostat, if needed.
Recalibrate thermostat to clear. Replace thermostat, if needed.
Recalibrate thermostat to clear. Replace thermostat, if needed.
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.
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