Homeowner Service Codes - Lennox icomfort Wi-Fi Setup Manual

Table 5. Alert Codes and Troubleshooting
Alert
Priority Alert Text
Code
418 Moderate (Outdoor Unit) There is a faulty W" output cir-
cuit.
419 Critical (Outdoor Unit) The W" output on the outdoor
unit has reported more than 5 errors. As a re-
sult, the system has shutdown the outdoor unit.
420 Critical (Air Handler) The heat pump defrost cycle has
taken more than 20 minutes to complete.
421 Critical (Outdoor Unit) The W" output terminal on the
outdoor unit is not wired correctly.
700 Moderate (Stat) The temperature sensor in the thermostat
is not working properly.
701 Moderate (Stat) The thermostat is reading indoor tempera-
tures above the pre−programmed limit.
702 Moderate (Stat) The thermostat is reading indoor tempera-
tures below the pre−programmed limit.
703 Moderate (Stat) The humidity sensor in the thermostat is
not working properly.
704 Moderate (Stat) The thermostat is reading indoor humidity
levels above the pre−programmed limit.
705 Moderate (Stat) The thermostat is reading indoor humidity
levels below the pre−programmed limit.
Ohm The ohm reading in the system is either too
Check high or too low.
Homeowner Service Alert Codes8
Number Value Number
3000 Filter 1 3002
3001 Filter 2 3003
506920−01 09/12
Value Number Value
Humidifier Pad 3004 Maintenance
UV Light 3005 PureAir Maintenance
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
Faulty W output circuit.
W output hardware fault count reached 5 strikes.
Defrost cycle lasts longer than 20 minutes. Check heat pump operation. Cleared
when W1 signal is removed. Applicable only in communicating mode with non−communicating heat
pump.
Voltage sensed on W output terminal when Y1 out is deactivated.
Recalibrate thermostat to clear. Replace thermostat if needed.
Recalibrate thermostat to clear; cool thermostat; adjust setpoint. Replace thermostat, 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 wiring, splices or other wiring defects that may be
causing the excessive resistance. If less than 70 ohms, check for shorted wires.
Number Value
4000 User WiFi state change, disable
4001 Firmware download failed
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Number Value
4002 Image file download failed