Diagnostic Mode - Lennox XC25-024-230-01 Installation And Service Procedure

Idle mode — System is energized with no demand
Display
Symbol or Display
Character
Displayed
Display string shows outdoor control firmware version 1 _ 6 > pause> A C or H P unit >pause>unit capacity in BTUs>pause >unit code. If 3
during start-up
horizontal bars are displayed during any sequence of this display string, it indicates that the specific parameter is not configured.
or power
recycling.
.
Idle mode — decimal flashes at 1 Hertz > 0.5 second ON, 0.5 second OFF
C or H
Indicates either cooling (
Code displays when system is in defrost mode. To enter defrost mode, unit must be running in heating mode, outdoor ambient must
d F
be below 65F and outdoor coil temperature must be below defrost termination temperature.
F
Indicates outdoor fan RPM speed.
A
in the display string represents the
ambient temperature in F at the
sensor on the outdoor unit. In display
A
configuration mode, it also repres­
ents the option for enabling both coil
and liquid line temperature on the
7-segment display string.
Error Code Recall Mode (NOTE - control must be in idle mode)
E To enter error code recall mode, push and hold button until solid E appears, then release button. Control displays up to 10 error codes stored
in memory. If E 0 0 0 is displayed, there are no stored error codes.
—
To exit error code recall mode, push and hold button until solid three horizontal bars appear, then release button. Note - Error codes are not
—
— cleared.
To clear error codes stored in memory, continue to hold button while the 3 horizontal bars are displayed. Release button when solid c is
c
displayed.
Push and hold for one (1) second, release button. 7-Segment displays
c
0 0 0 0 and exits error recall mode.
FIELD TEST MODE OPERATION
The field test mode allows the unit to be put into diagnostic
mode and allows the installer to perform multiple tests on
the control / unit.

Diagnostic Mode

Diagnostic mode is only available when the system is idle
or during an active / suspended call for heating or cooling.
Diagnostic mode is terminated when the exit command is
given, the button is pressed and released without entering
the diagnostic menu or 10 minutes has passed, whichever
comes first.
When this mode is selected all installed temperature
sensor valves (non-open and non-short) are shown on the
7-segment display. The following system status codes are
displayed:
Cooling
D
Percentage demand operation
D
Outdoor fan RPM
D
Active error codes
D
XC25
— Decimal flashes at 1 Hertz > 0.5 second ON, 0.5 second OFF.
Fan Test and Display String Option
C H
) or heating ( ) mode and demand percentage.
Control must be in Idle mode: To enter fan test option -
until solid – appears, release button. Display begins flashing. Within 10 seconds, push and
hold button until required symbol
in 10 seconds, push and hold button until display stops flashing, release button. Control
outputs DC voltage on PWM and COM terminals. Outdoor fan cycles ON for 10 minutes at
490 RPM. To exit test – Push and hold button until three horizontal bars display. Release
button, outdoor fan cycles OFF.
Control can be in Idle or demand mode: To enter display configuration option -
and hold button until solid – appears, release button. Display begins flashing. Within 10 sec­
onds, push and hold button until required symbol
flashing. Within 10 seconds, push and hold button until display stops flashing, release button.
Display shows error (E) code(s), ambient (A), outdoor coil (c) and liquid (L) temperatures in
Fahrenheit.
NOTE - If button is not pushed in the 10-second time period, the control exits the test mode. If
this occurs, test mode must be repeated.
F
displays, release button. Display begins flashing. With­
Outdoor Fan Mode
Diagnostic mode is only available while the system is in idle
mode. This mode can be exited with the proper command
or after 10 minutes has passed.
In diagnostic mode, the control ,energizes the outdoor fan
at the highest speed. The control continuously displays the
fan RPM on the 7-segment display.
PUMP DOWN MODE OPERATION
1. Turn room thermostat OFF.
2. Install a set of refrigerant gauges on the system to
monitor the pressure.
NOTE - All operation monitoring devices: High pressure
switch, low pressure switch and compressor internal vacu­
um protection remain active in the system. This will prevent
the compressor from recovering all the system refrigerant
into the outdoor unit.
NOTE - If the pump down jumper is in the ON position dur­
ing power-up, it is ignored.
3. Move the Pump Down jumper (page 26 for location)
from the OFF position to the ON position.
36
F
mode, push and hold button
A
mode, push
A
displays, release button. Display begins