Lennox SIGNATURE SLP99UH090XV36C - Integrated Control Diagnostic Codes

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Integrated Control Diagnostic Codes
Press the diagnostic push button and hold it to cycle through a menu of options. Every ve seconds a new menu item will be displayed.
Release the button when the desired mode is displayed.
When a solid ”P” is displayed, the furnace capacity/ size is programmed.
When the solid “E” is displayed, the control enters the Error Code Recall mode. Error Code Recall mode menu options: No change (displaying error
history) remains in Error Code Recall mode; solid “b” exits Error Code Recall mode; and solid “c” clears the error history. Must press button while ashing
“c” is displayed to clear error codes.
When the solid “-” is displayed, the control enters the Field Test mode. Field Test mode menu options: Solid “C” starts pressure switch calibration; blinking
“-” exits Field Test mode.
Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover
. Idle mode (Decimal blinks at 1 Hertz -- 0.5 second ON, 0.5 second OFF).
A
Cubic feet per minute (cfm) setting for indoor blower (1 second ON, 0.5
second OFF) / cfm setting for current mode displayed.
C
Cooling stage (1 second ON, 0.5 second OFF) / 1 or 2 displayed / Pause /
cfm setting displayed / Pause / Repeat codes).
d
Cooling stage (1 second ON, 0.5 second OFF) / 1 or 2 displayed / Pause /
cfm setting displayed / Pause / Repeat codes).
h
Variable Capacity Heat (1 second ON, 0.5 second OFF) / % of input rate
displayed / Pause/ cfm setting / Pause/ Repeat codes.
H
Heat Stage (1 second ON, 0.5 second OFF) / 1 or 2 displayed / Pause / cfm
setting displayed / Pause / Repeat codes.
df Defrost mode.
U Discharge air temperature
-
-
Soft disable - Soft disabling is when thermostat nds a device on the BUS
that it does not recognize and the thermostat sends a the device a message
to be in soft disabling mode until properly congured. Two horizontal bars
will display.
Steps to follow if the damper control module is
displaying the soft disable code.
Conrm proper wiring between all devices
(thermostat, damper control module, indoor and
outdoor).
Cycle power to the control that is displaying the soft
disable code.
Put the room thermostat through set up.
Go to setup / system devices / thermostat / edit /
then push reset.
Go to setup / system devices / thermostat / edit /
then push resetAll.
E105
Device communication problem - No other devices on BUS (Communication
system).
Equipment is unable to communicate. Check for mis
wire and loose connections and check for a high
voltage source of noise close to the system. (welder
etc.).
E110
Low line voltage. Line Voltage low (Voltage lower than nameplate
rating) Check voltage.
E113
High line voltage. Line Voltage High (Voltage higher than nameplate
rating) Check voltage.
E114 Line voltage frequency out-of-range. No 60 hertz power (Check voltage and frequency).
E115
Low 24V - Control will restart if the error recovers. 24 voltage low (Range is 18 to 30 volts) Check
voltage.
E120
Unresponsive device. Usually caused by delay in outdoor unit responding
to indoor unit poling recycle power, check wiring.
E124
Active communicating thermostat signal missing for more than 3 minutes. Equipment lost communication with the thermostat.
Check connections and cycle power on the
thermostat.
E125
Control failed self-check, internal error, failed hardware. Will restart if error
recovers. Integrated furnace control not communicating. Covers hardware
errors (ame sense circuit faults, pin shorts, etc.).
Hardware problem on the control board. Cycle
power on control. Replace if problem prevents
service and is persistent.
E126
Failed internal control communication between microcontrollers. Hardware problem on the control board. Cycle
power on control. Replace if problem prevents
service and is persistent.
E180
Outdoor air sensor failure - NO error if disconnected. Only shown if
shorted or out-of-range.