Service manual

12-1
TROUBLESHOOTING
Revision Y06-02Service Manual - KN Series
12. TROUBLESHOOTING
ELECTRICAL & CONTROL TROUBLESHOOTING
ATTENTION : check for broken or loose cable lugs first.
NO SYMPTON PROBABLE CAUSE CORRECTIVE ACTION
1. 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
2. The operating
indicator (green led)
does not light up.
The remote control
batteries are discharged
-Replace batteries of the remote control
3. 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.
4. The indoor fan does
not function correctly.
Check the voltage between
indoor fan terminals on the
main P.C.B
- If there is voltage replace capacitor or
motor.
5. The outdoor fan does
not function correctly.
Check the voltage between
indoor fan terminals on the
main P.C.B.
There is voltage between
outdoor fan terminals on
the outdoor unit.
There is no voltage
between outdoor fan
terminals on the outdoor
unit.
- If there is no voltage replace main P.C.B
- Replace capacitor or motor.
- Check and repair electrical wiring between
indoor and outdoor units.
6. The compressor does
not start up.
Check voltage on
compressor terminals on
the outdoor unit. (with
ampmeter)
Check if there is correct
voltage between
compressor terminals on
the outdoor unit.
-If no voltage replace main P.C.B.
- If low voltage repair power supply.
-If the voltage corrrect replace capacitor or
compressor.
-If there is no voltage repair electrical wiring
between indoor and outdoor units.
7. The ref
rigeration
system does not
function correctly.
Check for leaks or
restrictions, with
ampmeter, pressure guage
or surface thermometer.
- Repair refrigeration system and charge
refrigerant if necessary.
8. No cooling or heating
only indoor fan works.
Outdoor fan motor faulty or
other fault caused,
compresssor overload
protection cut out.
-Replace P.C.B.
- Outdoor fan blocked remove obstructions.
CONTENT