508189-01
Issue 2116
Page 10 of 42
Display
Action (when button released)
No change (idle)*
Remain in idle mode
Solid “E”
Enter diagnostic recal mode
Solid “F”
Enter flame signal mode
* No change implies the display will continue to show whatever is currently being displayed for normal operation (blinking decimal,
active error code, heat state, etc.)
Table 3. Integrated Control Diagnostic Modes
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).
C
Cooling stage (1 second ON, 0.5 second OFF)
1 or 2 displayed / Pause / Repeat codes.
d
Dehumidification mode (1 second ON, 1
second OFF) / Pause / Repeat Codes).
H
Gas Heat Stage (1 second ON, 0.5 second
OFF) 1 or 2 displayed / Pause / Repeat codes.
Blinking during ignition.
h
Heat pump stage.
E110
Low line voltage.
Line Voltage Low (Voltage lower than nameplate rating). Check power line
voltage and correct. Alarm clears 5 seconds after fault recovered.
E111
Line voltage polarity reversed.
Reverse line power voltage wiring. System resumes normal operation 5
seconds after fault recovered.
E112
Ground not detected.
System shuts down. Provide proper earth ground. System resumes normal
operation 5 seconds after fault recovered.
E113
High line voltage.
Line Voltage High (Voltage higher than nameplate rating). Provide power
voltage within proper range. System resumes normal operation 5 seconds
after fault recovered.
E114
Line voltage frequency out-of-range.
No 60 Hertz Power. Check voltage and line power frequency. Correct
voltage and frequency problems. System resumes normal operation 5
seconds after fault recovered.
E115
Low 24V - Control will restart if the error
recovers.
24-Volt Power Low (Range is 18 to 30 volts). Check and correct voltage.
Check for additional power-robbing equipment connected to system. May
require installation of larger VA transformer to be installed in furnace / air
handler. Clears after fault recovered.
E117
Poor ground detected (Warning only)
Provide proper grounding for unit. Check for proper earth ground to the
system. Warning only will clear 30 seconds after fault recovered.
E125
Control failed self-check, internal error,
failed hardware. Will restart if error recovers.
Integrated control not communicating. Covers
hardware errors (flame sense circuit faults, pin
shorts, etc.).
Hardware problem on the control. Cycle power on control. Replace if
problem prevents service and is persistent. Critical alert. Cleared 300
seconds after fault recovered.
E200
Hard lockout - Rollout circuit open or previously
open.
Correct cause of rollout trip, or replace flame rollout switch. Test furnace
operation. Cleared after fault recovered.
E204
Gas valve mis-wired.
Check gas valve operation and wiring. Clears when repaired.
E205
Gas valve control relay contact shorted.
Check wiring on control and gas valve. If wiring is correct, replace control.
E206
Gas valve second-stage relay failure.
Furnace will operate on 1st stage for remainder of the heating demand.
Will clear after fault recovered. If unable to operate 2nd stage, replace
control.
E207
Hot surface ignitor sensed open.
Measure resistance of hot surface ignitor. Replace if open or not within
specified range found in IOM. Resumes normal operation after fault is
cleared.
Table 4. Integrated Diagnostic Codes / Status of Equipment
