Lennox XC20-024-230-01, Инструкция по установке и обслуживанию

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67
XC20
ERROR CODES :
Table 14. 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
®
or iComfort
®
S30 thermostat.
Alert
Codes
Priority Alarm Description Possible Causes and Clearing Alarm
E 105 Moderate
The outdoor control has lost com­
munication with either the thermo­
stat or indoor unit.
Equipment is unable to communicate. Indicates numerous message errors. In most
cases errors are related to electrical noise. Make sure high voltage power is separated
from RSBus. Check for mis­wired and/or loose connections between the stat, indoor
unit and outdoor unit. Check for a high voltage source of noise close to the system. Fault
clears after communication is restored.
E 120 Moderate
There is a delay in the outdoor unit
responding to the system.
Typically, this alarm/code does not cause any issues and will clear on its own. The alarm
/ code is usually caused by a delay in the outdoor unit responding to the thermostat.
Check all wiring connections. Cleared after unresponsive device responds to any in­
quiry.
E 124 Critical
The iComfort Wi­Fi
®
thermostat has
lost communication with the outdoor
unit
for more than 3 minutes.
Equipment lost communication with the thermostat. Check the wiring connections, ohm
wires and cycle power. The alarm stops all associated HVAC operations and waits for
a heartbeat message from the unit that's not communicating. The alarm / fault clears
after communication is re­established.
E 125 Critical
There is a hardware problem with
the outdoor control.
There is a control hardware problem. Replace the outdoor control if the problem pre­
vents operation and is persistent. The alarm / fault is cleared 300 seconds after the fault
recovers.
E 131 Critical
The outdoor unit control parameters
are corrupted
Reconfigure the system. Replace the control if heating or cooling is not available.
E 132 Critical Internal software error. Replace outdoor control.
Unit Sensor Operations, Checkout and Status / Error Codes
OPERATION
Pins 5 and 6 (No Sensor)
There is no sensor located on positions 5 and 6 of the connector. A resistor installed between pins 5 and 6 on the cable
harness provides continuity for this circuit. This resistor (location shown in figure 50) provides resistance value between
314669 and 3779 ohms
.
If the resistor becomes damaged or lost, the outdoor control generates a false error code indicating
the coil temperature sensor is out of range or faulty (see table 15 on page 69). If resistor is damaged or missing, order re­
placement harness assembly (101334-05).
Ambient Temperature Sensor (RT13)
Ambient temperatures, as read by the ambient temperature sensor (shown in figure 50) which are below -35°F (-37°C) or
above 120°F (48°C) trigger a fault condition. If the ambient sensor is open, shorted, or out of the temperature range of the
sensor, the control does not perform demand defrost operation. The control reverts to time/temperature defrost operation
and displays the appropriate alert code (see table 15 on page 69). Heating and cooling operation is allowed in this fault
condition.
Liquid Line Temperature Sensor (RT36)
Liquid line temperatures below -40°F (-40°C) or above 140°F (60°C) trigger a fault condition and result in the appropriate
alarm code (see table15 on page 69). The outdoor control uses the liquid line sensor to change the fan speed, allowing
cooling operation at lowered ambient temperatures.