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506920−01 09/12
Page 54
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.
Table 5. Alert Codes and Troubleshooting
Alert
Code
Steps to clearAlert TextPriority
418 Moderate (Outdoor Unit) There is a faulty W" output cir-
cuit.
Faulty W output circuit.
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.
W output hardware fault count reached 5 strikes.
420 Critical (Air Handler) The heat pump defrost cycle has
taken more than 20 minutes to complete.
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.
421 Critical (Outdoor Unit) The W" output terminal on the
outdoor unit is not wired correctly.
Voltage sensed on W output terminal when Y1 out is deactivated.
700 Moderate (Stat) The temperature sensor in the thermostat
is not working properly.
Recalibrate thermostat to clear. Replace thermostat if needed.
701 Moderate (Stat) The thermostat is reading indoor tempera-
tures above the pre−programmed limit.
Recalibrate thermostat to clear; cool thermostat; adjust setpoint. Replace thermostat, if needed.
702 Moderate (Stat) The thermostat is reading indoor tempera-
tures below the pre−programmed limit.
Recalibrate thermostat to clear; warm thermostat; adjust setpoint. Replace thermostat, if needed.
703 Moderate (Stat) The humidity sensor in the thermostat is
not working properly.
Recalibrate thermostat to clear; adjust setpoint. Replace thermostat, if needed.
704 Moderate (Stat) The thermostat is reading indoor humidity
levels above the pre−programmed limit.
Recalibrate thermostat to clear. Replace thermostat, if needed.
705 Moderate (Stat) The thermostat is reading indoor humidity
levels below the pre−programmed limit.
Recalibrate thermostat to clear. Replace thermostat, if needed.
Ohm
Check
Ċ
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 wiring, splices or other wiring defects that may be
causing the excessive resistance. If less than 70 ohms, check for shorted wires.
Homeowner Service Alert Codes8
Number Value Number Value Number Value Number Value Number Value
3000 Filter 1 3002 Humidifier Pad 3004 Maintenance 4000 User WiFi state change, disable 4002 Image file download failed
3001 Filter 2 3003 UV Light 3005 PureAir Maintenance 4001 Firmware download failed