508151-01
Issue 2104
Page 11 of 72
Code
Diagnostic Codes / Status of Equipment
Action Required to Clear and Recover
•
Idle mode (Decimal blinks at 1 Hertz - 0.5
seconds ON, 0.5 seconds OFF).
A
Cubic feet per minute (cfm) setting for indoor
blower (1 second ON, 0.5 seconds OFF) / cfm
setting for current mode displayed.
C
Cooling stage (1 second ON, 0.5 seconds 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
Heat pump stage (1 second ON, 0.5 seconds
OFF) / % of input rate displayed / Pause / cfm
setting / Pause / Repeat codes.
H
Gas Heat stage (1 second ON, 0.5 seconds OFF)
/ 1 or 2 displayed / Pause / cfm setting displayed /
Pause / Repeat codes. Blinking during ignition.
dF
Defrost mode.
U
Discharge Air Temperature
E105
Device communication problem - No other
devices on RS BUS (Communication system).
Equipment is unable to communicate. Indicates numerous message
errors. In most cases, errors are related to electrical noise. Make sure
high voltage power is separated from RSBus. Check for mis-wired and/or
loose connections between the stat, indoor unit, and outdoor unit. Check
for a high voltage source of noise close to the system. Fault clears after
communication is restored.
E110
Low line voltage.
Line Voltage low (Voltage tower than nameplate rating). Check power line
voltage and correct. Alarm clears 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 high (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.
E120
Unresponsive device (Communicating systems
only).
Usually caused by delay in outdoor unit responding to indoor unit poling.
Recycle power. Check all wiring connections. Cleared after unresponsive
device responds to any inquiry.
E124
Active communicating thermostat signal missing
for more than 3 minutes (Communicating systems
only).
Equipment lost communication with the thermostat. Check four wiring
connections, ohm wires, and cycle power at the thermostat. Alert stops
all services and waits for heartbeat message from thermostat (subnet
controller). Cleared after valid thermostat (subnet) message is received.
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. Cleared 300 seconds after
fault recovered.
E126 Control internal communication problem.
Hardware problem on the control. Cycle power on control. Replace if
problem prevents service and is persistent. Cleared 300 seconds after
fault recovered.
E131
Corrupted control parameters (Verify
configuration of system) (Communicating systems
only).
Reconfigure the system. Replace control if heating or cooling is not
available. Only applicable in the communicating mode not in startup. Exit
from Commissioning and Execute Se+ factory Default mode. Control will
still operate on default parameter settings.
Table 5. Integrated Diagnostic Codes/Status of Equipment