Diagnostic Information - Lennox ComfortSense 5500 Installation And Setup Manual

Diagnostic Information

Priority
0:high
Error Screen
Code Text 1:middle
2:low
high
4 temperature 0
protection
temperature
5 0
sensor error
memory
7 0
error
memory
8 0
error
Message
Condition
Type
High temperature protec­
tion when outdoor ambient
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
critical
ence between main ther­
mistor and sub-thermis­
tor which is greater than
5°F.
EEPROM error
critical
(Power ON)
critical EEPROM error (Operating)
System Action
All stages of heat are turned off
by safety relay. This error is
displayed on notification
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 dis­
played on notification screen.
System will operate in normal
mode operation until power off.
This error is displayed in notifi­
cation screen.
14
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 sen­
sor returns to normal oper­
ating range, the error mes­
sage will automatically clear
and the system will resume
operation.
Thermostat will need to be
replaced.