Lennox XC20-036-230-01

57
XC20
STATUS CODES:
When the compressor is running, the 7segment display on the outdoor control sends the current compressor demand (as a
percentage) to the room thermostat. (Example: C 5 0 – compressor is running at 50% of maximum speed.)
Figure 34. Compressor Operation, Checkout and Status/Error Codes
ERROR CODES:
Table 11. Outdoor Control 7-Segment Display Alert Codes - Compressor
System fault and lockout codes take precedence over system status codes (cooling, heating operating percentages or defrost/dehumidification). Only
the latest active fault or lockout codes are displayed (if present). If no fault or lockout codes are active, then system status codes are displayed. Alert
codes are also displayed on the iComfort Wi-Fi
®
thermostat..
Alert
Codes
Inverter
Code
Inverter LED Flash
Code (number of
flashes)
Priority Alarm Description Possible Causes and Clearing Alarm
Red LED Green LED
E 430 26 2 flashes 6 flashes
Moderate /
Critical
Compressor start
failure
.
If condition is detected, outdoor unit compressor and fan stop.
Antishort cycle is initiated. If condition occurs 10 times within an
hour, system is locked out.
Indicates poor connection at compressor harness, improper
winding resistance, locked compressor rotor, or flooded com
pressor.
To clear, disconnect power to outdoor unit and restart.
E 433 29 2 flashes 9 flashes
Moderate /
Critical
The inverter has de
tected a compressor
over-current condi
tion
.
Error occurs when compressor peak phase current is greater
than 28A. Inverter issues code 14 first and slows down to try to
reduce the current. If the current remains high, outdoor unit com
pressor and fan stop. Antishort cycle is initiated. If condition oc
curs 5 times within an hour, system is locked out. To clear discon
nect power to outdoor unit and restart.
E 439 12 1 flash 2 flashes Moderate
Compressor slow
down due to high in
put current.
Input current is approaching a high limit. Compressor speed
automatically slows. The control continues sending the inverter
speed demanded by the thermostat. The control sets indoor
CFM and outdoor RPM to values according to demand percent
age rather than the actual Hz. Alarm is automatically clear.