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Table 7
LED Display
Diags
(Control Center)
Off On
Service Light
(Control Panel)
Error
Description
Fail-safe
(System Shut
Down)
Remedy
DIAG
1
DIAG
2
DIAG
3
DIAG
4
Code #1
FLASHING
Internal
Circuit Board
Failure
Yes Replace Control Center.
DIAG
2
DIAG
3
Code #2
DIAG
1
DIAG
4
FLASHING
Unsteady Input
or Cycling Input
(Thermostat
Diddling)
Yes
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.
DIAG
1
DIAG
2
DIAG
3
DIAG
4
Code #3
FLASHING
Multiple
Jumper Selection
Yes
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.
DIAG
2
DIAG
1
DIAG
3
DIAG.
4
Code #4
FLASHING
Internal
Circuit Board
Failure
Yes Replace Control Center.
DIAG.
1
DIAG.
2
DIAG.
3
DIAG.
4
Code #5
FLASHING
Internal
Circuit Board
Failure
Yes Replace Control Center.
DIAG.
1
DIAG.
2
DIAG.
3
DIAG.
4
Code #6
FLASHING
Defrost While Gas
Heat Selected
Yes
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.
DIAG
1
DIAG
2
DIAG
3
DIAG
4
Code #7
FLASHING
Internal
Circuit Board
Failure
Yes Replace Control Center.
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