Appendix A. Diagnostic Info. & Hidden Menu Tables - Lennox ComfortSense L7742U Programming Manual

Appendix B. Diagnostic Information and Hidden Menu Tables
Diagnostic Information Table
Mes
sage
Type Condition Display Text (Screen1)
Error AC power loss
with battery
(Battery Model
Only)
Error AC power loss
without battery:
AC power loss
for greater than
250ms
Error CPU memory
error
Note: If this Er-
ror occurs the
display goes
blank and all
relays are dis-
abled.
Error ROM error
Note: If this Er-
ror occurs the
display goes
blank and all
relays are dis-
abled.
Error Hi temperature
protection:
ambient temp.
exceeds 96F
(35.6C)
Error Local Temp
Sensor error:
local temp sen-
sor reads out
of range −40F
to 158F
Error EEPROM error
(Power ON)
Error EEPROM error
(Operating)
506180−01 09/08
No message
No message
Not operate
Not operate
No message
TEMP SENSOR ERROR
CALL FOR SERVICE
MEMORY ERROR
CALL FOR SERVICE
MEMORY ERROR
CALL FOR SERVICE
Display Text
(Screen2)
Priority
Contact Info. Screen 0−Red
Alert
Contact Info. Screen 0−Red
Alert
Contact Info. Screen 0−Red
Alert
Page 20
Action to Clear /
System Action
Thermostat can detect When AC power re-
AC power loss and Stat. covers stat. can detect
will operate with batter- and will operate on
ies. AC.
Super Cap Or Lithium When AC power (or
Battery will remember battery power) is re-
the clock. All outputs stored, normal opera-
will be off and O/B will tion resumes.
remember the last state.
All stages of heat are If temperature goes
turned off. down, it will start work-
ing again.
Indoor temp is dis- User have to call the
played as "EE" on the number from contact
home screen. This will information screen and
STOP all temperature have someone come
related operation. and replace the stat.
OR If the sensor read
back to with in the nor-
mal operating range,
the error message will
be cleared. Start work-
ing again.
System shall restore ev- User shall call the
erything to Energy Star dealer.
Default and operate. If
lithium Bat OR Super
Cap has Charge, it will
remember the previous
stored settings.
System shall operate in User shall call the
normal mode operation dealer.
until power off.
table continued on next page
Recovery
Condition