Appendix B. Diagnostic Information
Priority
Error
Screen
0:high
1:middle
Code
Text
2:low
high tem
perature
4
protection
temperatur
e sensor
5
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.
34
Action to Clear /
Recovery
Condition
Once temperature
drops below 96°F
(35.6°C), the system
resume operation.
Either thermostat
will have to be re
place or if the sen
sor returns to nor
mal operating
range, the error
message will auto
matically clear and
the system will re
sume operation.
Thermostat will
need to be replace.