Error Codes - Lennox XC25-024-230-01 Installation And Service Procedure

ERROR C C O C ODES:
Table 16. Outdoor Control 7-Segment Display Alert Codes - Outdoor Control Errors
NOTE - 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
Alert
Priority
Codes
The iComfort Wi-Fi
E 180 Critical found a problem with the outdoor
unit's ambient temperature sensor.
The outdoor coil sensor is either
open,
Moderate /
temperature is out of sensor range.
E 416
Critical
As a result the outdoor unit control
will not perform defrost.
E 424 Moderate Faulty outdoor liquid line sensor
DC Inverter Control Operation, Checkout, Status / Error Codes
OPERATION OF COMPONENTS:
Electromagnetic compatibility circuit (EMC): EMC ensures the correct operation of different equipment items which use or
respond to electromagnetic phenomena. It also helps to negate the effects of interference. NOTE - The 2- and 3-ton inverter
has an EMC built­in. The 4- and 5-ton units have an external inverter.
CONVERTER:
Converts AC (alternating current) to DC (direct current).
POWER FACTOR CORRECTION (PFC) CIRCUIT:
The PFC module is an integrated part of the outdoor inverter that monitors the DC bus for high, low and abnormal voltage
conditions. If any of these conditions are detected, the PFC function and compressor will stop.
INTELLIGENT (INVERTER) POWER MODULE (IPM):
The IPM converts DC power into AC power. The control method is known as pulse width modulation (PWM). This means the
DC is switched on and off very quickly (chopped) by the transistor switches to make simulated AC at required frequency and
voltage.
COMMUNICATION CONTROL CIRCUIT:
Receives and sends message between the inverter and the outdoor control.
Power Factor Correction Circuit
Intelligent Power Module
XC25
Alarm Description
®
thermostat has
short-circuited or the
Converter
Figure 52. 2- and 3-Ton Unit Inverter
Possible Causes and Clearing Alarm
During normal operation, after the outdoor control recognizes sensors, the alarm will
be sent only if valid temperature reading is lost. Compare outdoor sensor resistance to
temperature/resistance charts in unit installation instructions. Replace sensor pack if
necessary. At the beginning of (any) configuration, furnace or air-handler control will
detect the presence of the sensor(s). If detected (reading in range), appropriate
feature will be set as 'installed' and shown in the iComfort Wi-Fi
screen. The alarm / fault will clear upon configuration, or sensing normal values.
Coil sensor is detected as open or shorted, or temperature is out of coil sensor range.
Outdoor unit control will not perform demand or time/temperature defrost operation.
System will still heat or cool. Check the resistance of the coil sensor and compare to
temperature resistance chart. Replace coil sensor if needed. The alarm clears when
outdoor unit control detects proper coil sensor readings or after a power reset.
Sensor is open or shorted. Replace the sensor.
Communication Control
66
Electromagnetic Compatibility Circuits
®
thermostat.
®
thermostat 'About'