Troubleshooting - Electra DNG 18 Service Manual

14.

TROUBLESHOOTING

ELECTRICAL & CONTROL TROUBLESHOOTING
ATTENTION: check for broken or loose cable lugs first.
NO SYMPTON
1. The stand-by indicator
(red led) on the central
control display panel
doesn't light up.
2. The operation indicator
(green led) on the
central control display
panel does not light up.
3. The operation indicator
(green led) does not
light up when starting
from unit.
4. The indoor fan does
not function correctly.
5. The outdoor fan does
not function correctly.
6. The compressor does
not start up.
7. The refrigeration
system does not
function correctly.
8. No cooling or heating
only indoor fan works.
Service Manual - DNG Series
PROBABLE CAUSE
There is no correct voltage
between the line and neutral
terminals on main P.C.B.
The remote control batteries
are discharged
Check main P.C.B and
display P.C.B.
Check the voltage between
indoor fan terminals on the
main P.C.B.
Check the voltage between
outdoor 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.
Check voltage on
compressor terminals on
the outdoor unit. (with
ammeter)
Check if there is correct
voltage between
compressor terminals on
the outdoor unit.
Check for leaks or
restrictions, with ammeter,
pressure gauge or surface
thermometer.
Outdoor fan motor faulty or
other fault caused,
compressor overload
protection cut out.
Revision Y05-01
CONTENT
TROUBLESHOOTING
CORRECTIVE ACTION
-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
-Replace batteries of the remote
control
-Replace P.C.B if necessary.
- If there is voltage replace capacitor
or motor.
- If there is no voltage replace main
P.C.B
- Replace capacitor or motor.
- Check and repair electrical wiring
between indoor and outdoor units.
-If no voltage replace main P.C.B.
- If low voltage repair power supply.
-If the voltage correct replace
capacitor or compressor.
-If there is no voltage repair electrical
wiring between indoor and outdoor
units.
- Repair refrigeration system and
charge refrigerant if necessary.
-Replace P.C.B.
- Outdoor fan blocked remove
obstructions.
14-1