507341-01
34
Table 1. 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
439
Moderate
Compressor slowdown due to high input cur
rent.
Input current is approaching a high limit. Compressor speed will automatically slow down.
The control continues sending the inverter speed demanded by the thermostat. The con
trol will set indoor CFM and outdoor RPM to values according to demand percentage
rather than the actual Hz. Alarm is automatically clear.
440
Moderate
Compressor slowdown due to high heatsink
temperature.
Heat sink temperature is approaching limit. The compressor speed will automatically slow
down to reduce heatsink temperature. The control will set indoor CFM and outdoor RPM
to values according to demand percentage rather than the actual Hz. Alarm is automatic
ally cleared.
441
Moderate
Compressor slowdown due to high com
pressor current.
Compressor current is approaching high limit. The compressor speed will automatically
slow down. The control will set indoor CFM and outdoor RPM to values according to de
mand percentage rather than the actual Hz. Alarm is automatically cleared.
442
Critical
The top cap switch has opened 5 times with
in 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
thermostat from the system while applying power and reprogramming.
530
Moderate /
Critical
Low Damper 24VAC Voltage
•
Damper Supply voltage is < 18VAC.
•
Maintain nonzone mode for 5 minutes after alarm clears.
532
Moderate
Zoning Pressure Switch Opened (high pres
sure)
Compressor pressure is above the specified limit. Compressor is turned off. Zoning will be
restored 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.
544
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.
