Outdoor Control Operation, Checkout And Status / Error Codes - Lennox XC20-036-230-01 Installation And Service Procedure

Elite xc20 series
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Outdoor Control Operation, Checkout and Status / Error Codes

OPERATION:
The outdoor control is a microprocessor-based device for use with variable-capacity compressors up to 5-tons in capacity
operating on 24VAC residential power. The outdoor control integrates the functionality of maintaining compressor speed,
demand, defrost and fan PWM controls. The outdoor control is self-configuring. During start-up the outdoor control selects
one of two configurations ­ variable-capacity air conditioner or variable-capacity heat pump.
NOTE - The green LED located on the outdoor control flashes when
communication occurs between the outdoor control and either the
thermostat or the inverter.
STATUS CODES:
Table 13. Outdoor Control 7-Segment Display Alert Codes - Outdoor Control Status
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 Codes
Priority
Compressor
E 600
Critical
been cycled OFF on
utility load shedding.
Outdoor unit has
been cycled OFF on
E 601
Critical
low
protection.
XC20
Figure 48. Outdoor Control Unit
®
or iComfort
Alarm Description
has
Load shedding function: Provides a method for a local utility company to limit the maximum power
level usage of the outdoor unit. The feature is activated by applying 24 volts AC power to the L and C
terminals on the outdoor control.
Low temperature Protection: Outdoor unit will not operate when the outdoor temperature is at or
below ­4°F (­20°C). If the unit is operating and the outdoor temperature drops below ­4°F (­20°C),
temperature
the unit will continue to operate until the room thermostat is satisfied or the outdoor temperature
drops to ­15°F (­26°C). (Outdoor unit ambient sensor provides temperature readings.)
WHEN UNIT IS IN PUMP-DOWN MODE, Pd WILL BE DISPLAYED
TO ACTIVATE PUMP-DOWN MODE, REFER TO PUMP-DOWN
®
S30 thermostat.
Possible Causes and Clearing Alarm
66
7-SEGMENT
DISPLAY
PUSH
BUTTON
ON 7-SEGMENT.
CYCLE SEQUENCE ON PAGE 39.

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