Lennox XC20-036-230-01 Installation And Service Procedure page 57

STATUS CODES:
When the compressor is running, the 7­segment 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
Inverter LED Flash
Code (number of
Alert Inverter
Code
Codes
Red LED
E 430 26 2 flashes
E 433 29 2 flashes
E 439 12 1 flash
®
thermostat..
Priority
flashes)
Green LED
Moderate /
6 flashes
Critical
Moderate /
9 flashes
Critical
2 flashes Moderate
Alarm Description
If condition is detected, outdoor unit compressor and fan stop.
Anti­short cycle is initiated. If condition occurs 10 times within an
hour, system is locked out.
Compressor start
Indicates poor connection at compressor harness, improper
failure
.
winding resistance, locked compressor rotor, or flooded com­
pressor.
To clear, disconnect power to outdoor unit and restart.
Error occurs when compressor peak phase current is greater
The inverter has de­ than 28A. Inverter issues code 14 first and slows down to try to
tected a compressor reduce the current. If the current remains high, outdoor unit com­
over-current condi­ pressor and fan stop. Anti­short cycle is initiated. If condition oc­
curs 5 times within an hour, system is locked out. To clear discon­
tion
.
nect power to outdoor unit and restart.
Input current is approaching a high limit. Compressor speed
Compressor slow­
automatically slows. The control continues sending the inverter
down due to high in­
speed demanded by the thermostat. The control sets indoor
put current.
CFM and outdoor RPM to values according to demand percent­
age rather than the actual Hz. Alarm is automatically clear.
57
Possible Causes and Clearing Alarm
XC20