Integrated Control Diagnostic Codes - Lennox SLP98UHV Installation Instructions Manual

Integrated Control Diagnostic Codes

Press the diagnostic push button and hold it to cycle through a menu of options. Every five 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 (dis-
playing 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 flashing 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
.
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
Dehumidification mode (1 second ON) / 1 second OFF) / 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.
E 105
Device communication problem − No other devices on BUS (Communication
system).
E 110
Low line voltage.
E 113
High line voltage.
E 114
Line voltage frequency out−of−range.
E 115
Low 24V − Control will restart if the error recovers.
E 120
Unresponsive device.
E 124
Active communicating thermostat signal missing for more than 3 minutes.
E 125
Control failed self−check, internal error, failed hardware. Will restart if error
recovers. Integrated furnace control not communicating. Covers hardware errors
(flame sense circuit faults, pin shorts, etc.).
E 126
Failed internal control communication between microcontrollers.
E 131
Corrupted control parameters (Verify configuration of system).
E 180
Outdoor air sensor failure − NO error if disconnected. Only shown if shorted or
out−of−range.
E 200
Hard lockout − Rollout circuit open or previously open.
E 201
Indoor blower communication failure − Unable to communicate with blower motor.
E 202
Indoor blower motor mis−match − Indoor motor horsepower does not match unit
capacity.
E 203
Appliance capacity / size is NOT programmed. Invalid unit codes refer to
configuration flow chart in installation instructions.
E 204
Gas valve mis−wired.
E 205
Gas valve control relay contact shorted.
E 207
Hot surface ignitor sensed open − Refer to troubleshooting in installation
instruction.
Diagnostic Codes/Status of Equipment
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.).
Line Voltage low (Voltage lower than nameplate rating)
Check voltage.
Line Voltage High (Voltage higher than nameplate rating)
Check voltage.
No 60 hertz power (Check voltage and frequency).
24 voltage low (Range is 18 to 30 volts) Check voltage.
Usually caused by delay in outdoor unit responding to
indoor unit poling recycle power, check wiring.
Equipment lost communication with the thermostat. Check
connections and cycle power on the thermostat.
Hardware problem on the control board. Cycle power on
control. Replace if problem prevents service and is
persistent.
Hardware problem on the control board. Cycle power on
control. Replace if problem prevents service and is persis-
tent.
Reconfigure the system. Replace board if service (heating
/cooling) is unavailable.
Compare outdoor sensor resistance to temperature
resistance charts in installation instructions. Replace if
necessary.
Correct unit cause of rollout trip or replace flame rollout
switch and test furnace operation.
Indoor blower communication failure including power
outage.
Incorrect furnace size code selected. Check unit size
codes on configuration guide or in installation instructions.
No furnace size code selected. Check unit size codes on
configuration guide or in installation instructions.
Check operation of gas valve.
Check operation of gas valve.
Measure resistance of Hot Surface Ignitor, replace if open
or not within specification.
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Action Required to Clear and Recover