Lennox 10T50 User Manual

18
Table 10. Alert Codes and Troubleshooting
Alert Code Priority
Condition
Applicable System
Component(s)
Alert Text Component or System Operational State
and Troubleshooting Tip
How to clear the alert code
114
Moderate /
Critical
Lennox Communicating
Furnace, air handler, EIM or
IHarmony
There is a frequency /
distortion problem with
the power to a specic
system component.
√ This alert code may indicate transformer overload ing.
√ Check the voltage and line power frequency.
√ Check the generator operating frequency, if the system is running
on back-up power.
√ Correct voltage and frequency problems.
√ System will resume normal operation ve seconds after fault
recovered.
√ All applicable system component outputs are dis abled – moderate
condition.
√ After 10 minutes, the priority condition is escalated – critical
condition.
√ Damper control module will operate in central mode only until proper
voltage is restored or frequency dis tortion is resolved – moderate
condition.
Automatically clears when
the system detects the
issue no longer exists.
115 Critical
Lennox Communicating
Furnace, air handler or EIM
Primary 24VAC power
to a system compo nent
control is lower than
the required range of
18 to 30VAC.
√ Check and correct voltage.
√ Check for additional power-robbing system compo nents (devices)
connected to system.
√ This alert code may require the installation of an ad ditional or larger
VA transformer.
Automatically clears when
the system detects the
issue no longer exists.
120 Moderate
All Lennox Communicating
thermostats.
Lennox communicating
furnace, air handler, outdoor
unit, EIM or iHarmony
There is a delay in the
system component
responding to the
system.
Typically this alert code does not cause any opera tional issues and
will clear on its own.
√ This alert code is usually caused by a delay in the outdoor unit
responding to the thermostat.
√ Check all wiring connections.
Automatically clears after
an unresponsive system
compo nent (device) re-
sponds to any in quiry.
124 Critical
All Lennox Communicating
thermostats.
Lennox communicating
furnace, air handler, outdoor
unit, EIM or iHarmony
The thermostat has lost
communication with
a system compo nent
for more than three
minutes.
System component has lost communication with the thermostat.
√ Check the wiring connections.
√ Ohm wires.
√ Cycle power.
√ Check voltage at component.
This alert code stops all associated system operations and waits for a
heartbeat message from the system component that is not communi-
cating.
Automatically clears after
com munication is re- estab-
lished with applicable sys-
tem component (de vice).
125 Critical
All Lennox Communicating
thermostats.
Lennox communicating
furnace, air handler, outdoor
unit, EIM or iHarmony
There is a hardware
problem on a system
component control.
There is a control hardware problem.
√ Replace the control if the problem prevents opera tion and is
persistent.
√ Damper control module will remain in non-zone mode (all dampers
open) for ve minutes after priori ty condition no longer exist.
√ Remove jumper if present on indoor unit between R and W2 if
equipment interface module is in use.
Automatically clears 300
sec onds after the is sue no
longer ex ists.

Lennox 10T50 Specifications

General

Brand	Lennox
Model	10T50
Category	Recording Equipment
Language	English