OPTIONAL ACCESSORIES
13-22
Revision 0
Service Manual - KXL DCI
13.3.2
Indoor Unit Diagnostics and Corrective Actions
No.
Fault
Probable Cause
Corrective Action
1
Sensor failures
of all types
Check sensor
connections or replace
sensor
2
Communication
mismatch
Indoor and Outdoor
controllers are with
different versions
Replace Indoor controller
3
No
Communication
Communication or
grounding wiring is not
good.
Check Indoor to Outdoor
wiring and grounding
4
No Encoder
Indoor electronics or
motor
Check motor wiring, if ok,
replace motor, if still not
ok, replace Indoor
controller.
5
Outdoor Unit
Fault
Outdoor controller
problem
Switch to Outdoor
diagnostics.
6
EEPROM Not
Updated
System is using ROM
parameters and not
EEPROM parameters
No action, unless special
parameters are required
for unit operation.
7
Bad EEPROM
No action, unless special
parameters are required
for unit operation.
8
Bad
Communication
Communication quality
is low reliability
Check Indoor to Outdoor
wiring and grounding
9
Using EEPROM
data
No problem. System is
using EEPRRRROM
parameters
10
The power supply
indicator (red led)
doesn’t light up.
There is no correct voltage
between the line and
neutral terminals on main
P.C.B.
-If the voltage is low repair
power supply.
-If there is no voltage repair
general wiring.
-If there is correct voltage
replace main or display
P.C.B’S
11 The
operating
indicator (green
led) does not light
up.
The remote control
batteries are discharged
-Replace batteries of the
remote control
12 The
operating
indicator (green
led) does not light
up when starting
from unit..
Check main P.C.B and
display P.C.B.
-Replace P.C.B if necessary.
