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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 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 set-
ting displayed / Pause / Repeat codes.
df
Defrost mode.
E 105
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.).
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
persistent.
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
persistent.
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
outage.
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.