Appendix B. Diagnostic Information - Lennox ComfortSense 7500 Installation And Setup Manual

Appendix B. Diagnostic Information

Priority
0:high
Error Screen
1:middle
Code Text
2:low
high tem­
perature
4
protection
temperature
5
sensor error
memory
7
error
memory
8
error
Message
Condition
Type
High temperature protec­
tion when outdoor ambient
0 critical
temperature exceeds 96°F
(35.6°C)
Local temperature sen­
sor is out of range -40°F
to 158°F
There is a finite differ­
0 critical
ence between main ther­
mistor and sub-thermis­
tor which is greater than
5°F.
EEPROM error
0 critical
(Power ON)
0 critical EEPROM error (Operating)
System Action
All stages of heat are turned off
by safety relay.
This error is displayed on notifi­
cation screen.
Indoor temp is displayed as "--"
on the home screen. This will
STOP all temperature related
operation.
All stages of heat are turned off
by safety relay.
This error is displayed on notifi­
cation screen.
System will restore using to En­
ergy Star defaults and resume
operations.
This error is displayed on notifi­
cation screen.
System will operate in normal
mode operation until power off.
This error is displayed in notifi­
cation screen.
43
Action to Clear /
Recovery Condition
Once temperature
drops below 96°F
(35.6°C), the system
resume operation.
Either thermostat will
have to be replace or
if the sensor returns to
normal operating
range, the error mes­
sage will automatically
clear and the system
will resume operation.
Thermostat will need
to be replace.