Lennox Harmony II Zone Control System Installation Instructions Manual page 35

LED Display
Diags
Service Light
(Control Center)
(Control Panel)
Off On
Code #1
DIAG
1
DIAG
2
DIAG
3
DIAG
FLASHING
4
Code #2
DIAG
1
DIAG
2
DIAG
3
DIAG
4 FLASHING
Code #3
DIAG
1
DIAG
2
DIAG
3
DIAG
4
FLASHING
Code #4
DIAG
1
DIAG
2
DIAG
3
DIAG.
FLASHING
4
Code #5
DIAG.
1
DIAG.
2
DIAG.
3
DIAG.
4 FLASHING
Code #6
DIAG.
1
DIAG.
2
DIAG.
3
DIAG.
4
FLASHING
Code #7
DIAG
1
DIAG
2
DIAG
3
DIAG
FLASHING
4
Table 7
Fail safe Fail-safe
Error
(System Shut
Description
Down)
Internal
Circuit Board Yes
Failure
Unsteady Input
or Cycling Input
Yes
(Thermostat
Diddling)
Multiple
Yes
Jumper Selection
Internal
Circuit Board Yes
Failure
Internal
Circuit Board Yes
Failure
Defrost While Gas
Yes
Heat Selected
Internal
Circuit Board
Yes
Failure
Page 35
Remedy
Replace Control Center.
Disconnect thermostats, pressure switch and control panel
one at a time until error goes away. This will identify the source
of bad input. If error remains after all inputs have been discon-
nected, replace control center.
Each jumper block on the control center is allowed only one
jumper (except for the DISCH AIR TEMP block.) Remove extra
jumper. DISCH AIR TEMP block is allowed two jumpers, but
they must not be both C− and C+, or H− and H+. Only one selec-
tion for heating and one for cooling is allowed.
Replace Control Center.
Replace Control Center.
The system has detected a defrost signal at W1 of the OUT-
DOOR UNIT terminal block while the jumper is selected for
G21V or GAS. May be caused by:
1) Wrong selection for INDOOR UNIT jumper.
2) OUTDOOR UNIT terminal block miswired or
3) Control Center failure.
Check unit installation instructions for correct wiring. If no sig-
nal is present at W1, then replace control center.
Replace Control Center.