Service manual

TROUBLESHOOTING
12. TROUBLESHOOTING
WARNING!!!
When Power Up – the whole outdoor unit controller, including the wiring, is under
HIGH VOLTAGE!!!
Never open the Outdoor unit before turning off the Power!!!
When turned off, the system is still charged (400V)!!!
It takes about 1 Min. to discharge the system.
Touching the controller before discharging may cause an electrical shock!!!
For safe handling of the controller please refer to section 12.5 below.
12.1 General System Failures and Corrective Actions
No SYMPTOM PROBABLE CAUSE CORRECTIVE ACTION
1.
Indoor unit power supply indicator (Red
LED) does not light up.
No power supply
Check power supply. If OK, check
displ
ay and display wiring. if OK,
replace controller
Check remote control batteries, if
2.
Indoor unit does not respond to remote
control mess
age
Remote control message not
reached the indoor unit
OK, check display and display
w
iring, if OK, replace display PCB.
If still not OK replace controller
3.
Indoor unit responds to remote control
message but Operate i
ndicator (Green
LED) does not light up
Problem with display PCB
Replace display PCB.
If still not OK replac
e controller
Unit in heat mode and coil is
still not
warm
Change to cool mode
Outdoor unit is in opposite
mode
Change operation mode
4.
Indoor fan does not start (louvers are
ope
ned and Green LED is ON)
Problem with controller or
capacit
or
Change to high speed and Check
po
wer supply to motor is higher
than 130VAC (for triack controlled
motor) or higher than 220VAC for
fixed speed motors, if OK replace
capacitor, if not OK replace
controller
Indoor fan works when unit is OFF, and
5.
indoor fan speed is not changed by
Controller problem Replace controller
remote control command.
6. Water leakage from indoor unit
Indoor unit drainage tube is
blocke
d
Check and open drainage tube
One indoor unit or more are operating in
7.
cool mode with no capacity, and the other
units have water leaks/freezing problems The communication wires of
the ind
oor units are switched
Check and correct the
communication wires connection
8.
One indoor or more are operating in heat
mode with a limited capacity, and the coil
on the other units are very hot.
Check the connections and the
No power supply
wiring on the main terminal -
Repa
ir if needed.
9.
Outdoor unit display board and leds are
off
PFC Chock coil
Check the PFC Chock coil
(12.4.3)
Burnt fuse
Check 20A fuse on the Filter
(12.4.2)
10.
Compressor operates but one or more
units generates no capacity
EEV problem Check EEV (12.4.7)
Refrigerant leakage Check refrigeration system (12.2)
Revision 0 12-1