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Code
Diagnostic Codes / Status of Equipment
Idle mode (Decimal blinks at 1 Hertz - 0.5 seconds
ON, 0.5 seconds OFF).
Cubic feet per minute (cfm) setting for indoor blower
A
(1 second ON, 0.5 seconds OFF) / cfm setting for
current mode displayed.
Cooling stage (1 second ON, 0.5 seconds OFF) /
C
1 or 2 displayed / Pause / cfm setting displayed /
Pause / Repeat codes.
Dehumidification mode (1 second ON, 1 second
d
OFF) / cfm setting displayed / Pause / Repeat
codes.
Heat pump stage (1 second ON, 0.5 seconds OFF)
h
/ % of input rate displayed / Pause / cfm setting /
Pause / Repeat codes.
Gas Heat stage (1 second ON, 0.5 seconds OFF)
H
/ 1 or 2 displayed / Pause / cfm setting displayed /
Pause / Repeat codes. Blinking during ignition.
Defrost mode.
dF
E105
Device communication problem - No other devices
on RS BUS (Communication system).
E110
Low line voltage.
E113
High line voltage.
E114
Line voltage frequency out-of-range.
E115
Low 24V - Control will restart if the error recovers.
E120
Unresponsive device (Communicating systems
only).
E124
Active communicating thermostat signal missing
for more than 3 minutes (Communicating systems
only).
508364-01
Action Required to Clear and Recover
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.
Line Voltage low (Voltage tower than nameplate rating).
Check power line voltage and correct. Alarm clears 5
seconds after fault recovered.
Line Voltage high (Voltage higher than nameplate
rating). Provide power voltage within proper range.
System resumes normal operation 5 seconds after fault
recovered.
No 60 Hertz power. Check voltage and line power
frequency. Correct voltage and frequency problems.
System resumes normal operation 5 seconds after fault
recovered.
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.
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.
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.
Issue 2346
Page 59 of 74
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