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ERROR CODES:
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/dehumidi-
cation). 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 S30/S40 thermostat.
Alert
Codes
Priority Alarm Description Possible Causes and Clearing Alarm
E 105 Moderate
The outdoor control has
lost communication with
either the thermostat 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 inquiry.
E 124 Critical
The iComfort S30®
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 re-established.
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 prevents
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
Recongure the system. Replace the control if heating or cooling is not available.
E 132 Critical Internal software error Replace outdoor control.
Unit Sensor Operation, Checkout and Status /Error Codes
OPERATION:
6-Pin Sensor Harness (DIS, AMB, COIL)
Discharge Sensor (R7 - No Sensor)
There is no sensor located on positions 5 and 6 of the connector. A 10K Ohm resistor installed between pins 5 and 6 on
the cable harness provides continuity for this circuit.
Ambient Temperature Sensor (RT13)
Ambient temperatures, as read by the ambient temperature sensor connected to pin 3 and pin 4, 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 displays the appropriate alert code. Heating and cooling operation is allowed in this fault
condition
Coil Temperature Sensor (R7 - No Sensor)
There is no sensor located on position 1 to position 2 of the connector. A 10K ohm resistor is installed between pins 1 and
2 on the cable harness and provides continuity for this circuit.
4-Pin Suction Temperature Sensor / Liquid Temperature Sensor Harness
Suction Line Sensor (RT41)
Suction line temperature is read by the suction line temperature sensor between Pins 1 and Pin 2 of the 4-pin sensor
harness. Nominal Resistance of the sensor is 10K ohms at 77F. The control will display are E182 error code if the sensor
reads open or shorted for 24 hours. Cooling operation is allowed with this fault.
Liquid Line Temperature Sensor (RT36)
Liquid line temperature is read by the liquid line temperature sensor between Pins 3 and Pin 4 of the 4-pin sensor harness.
Nominal Resistance of the sensor is 10K ohms at 77F. The control will display are E184 error code if the sensor reads
open or shorted for 24 hours. Cooling operation is allowed with this fault.
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