Lennox CS7500 User Manual

30
Diagnostic Information
Error
Code
Screen Text Priority
0: high
1: middle
2: low
Message
Type
Condition System Action Action to Clear
/ Recovery
Condition
4
high
temperature
protection
0 critical
High temperature
protection when
outdoor ambient
temperature
exceeds 96°F
(35.6°C)
All stages of heat
are turned o󰀨 by
safety relay.
This error is displayed
on notication
screen.
Once temperature
drops below 96°F
(35.6°C), the
system resume
operation.
5
temperature
sensor error
0 critical
Local temperature
sensor is out
of range -40°F
to 158°F
There is a nite
di󰀨erence between
main thermistor
and sub-thermistor
which is greater
than 5°F.
Indoor temp is displayed
as “--” on the home
screen. This will
STOP all temperature
related operation.
All stages of heat
are turned o󰀨 by
safety relay.
This error is displayed
on notication
screen.
Either thermostat
will have to be
replace or if the
sensor returns to
normal operating
range, the error
message will
automatically
clear and
the system
will resume
operation.
7
memory
error
0 critical
EEPROM error
(Power ON)
System will restore
using to Energy Star
defaults and resume
operations.
This error is displayed
on notication
screen.
Thermostat
will need to be
replace.
8
memory
error
0 critical
EEPROM error
(Operating)
System will operate in
normal mode operation
until power o󰀨.
This error is displayed in
notication screen.

Lennox CS7500 Specifications

General

Brand	Lennox
Model	CS7500
Category	Thermostat
Language	English