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7/2013
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Table 10. 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
442
Critical
The top cap switch has opened 5 times within
one hour. As a result, the outdoor unit is
locked out
.
When compressor thermal protection sensor opens 5 times within 1 hour. Outdoor unit will
stop. To clear, disconnect power to outdoor unit and restart.
443
Critical
Incorrect appliance unit size code selected.
Check for proper configuring under unit size codes for outdoor unit on configuration guide or in
installation instructions. If replacing inverter, verify inverter model matches unit size. The
alarm/fault clears after the correct match is detected following a reset. Remove the thermo
stat from the system while applying power and reprogramming.
530
Moderate /
Critical
Low Damper 24VAC Voltage
Damper Supply voltage is < 18VAC.
Maintain non-zone mode for 5 minutes after alarm clears.
532
Moderate
Zoning Pressure Switch Opened (high
pressure)
Compressor pressure is above the specified limit. Compressor is turned off. Zoning will be re
stored once the high pressure switch closes.
542
Moderate/
Critical
Zone 1 Temperature Sensor Problem
Invalid temperature reading, Open or short sensor detected. System is restored 30 seconds
after fault is recovered.
543
Moderate/
Critical
Zone 2 Temperature Sensor Problem
Invalid temperature reading, Open or short sensor detected. System is restored 30 seconds
after fault is recovered.
543
Moderate/
Critical
Zone 3 Temperature Sensor Problem
Invalid temperature reading, Open or short sensor detected. System is restored 30 seconds
after fault is recovered.
545
Moderate/
Critical
Zone 4 Temperature Sensor Problem
Invalid temperature reading, Open or short sensor detected. System is restored 30 seconds
after fault is recovered.
594
Moderate
/ Critical
(Equipment Interface Module) Pre-coil dis
charge air temperature sensor problem (DFM
mode only). Advances from moderate to crit
ical after ten (10) minutes.
Interlock relay energized, but input not sensed after 3 seconds. No heating and cooling opera
tions. De-energize interlock relay and re-energized 5 minutes later if demand is still present.
Alarm clears 5 minutes after fault clears.
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 out
door 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 properly.
Recalibrate thermostat to clear. Replace thermostat if needed.
701
Moderate
(Thermostat) The thermostat is reading in
door temperatures above the pre-pro
grammed limit.
Recalibrate thermostat to clear; cool thermostat; adjust set point. Replace thermostat, if
needed.
702
Moderate
(Thermostat) The thermostat is reading in
door temperatures below the pre-pro
grammed limit.
Recalibrate thermostat to clear; warm thermostat; adjust set point. Replace thermostat, if
needed.
703
Moderate
(Thermostat) The humidity sensor in the ther
mostat is not working properly.
Recalibrate thermostat to clear; adjust set point. Replace thermostat, if needed.
704
Moderate
(Thermostat) The thermostat is reading in
door humidity levels above the pre-pro
grammed limit.
Recalibrate thermostat to clear. Replace thermostat, if needed.
705
Moderate
(Thermostat) The thermostat is reading in
door humidity levels below the pre-pro
grammed 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 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 CODES
Number
Value
Number
Value
Number
Value
Number
Value
Number
Value
3000
Filter 1
3002
Humidifier Pad
3004
Maintenance
4000
User Wi-Fi state change, disable
4002
Image file download failed
3001
Filter 2
3003
UV Light
3005
PureAir Maintenance
4001
Firmware download failed
