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