Product data

12—1 | SM YAZE218 1-A.2 GB
12—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 display and display wiring.
if OK, replace controller
2.
Indoor unit does not respond to remote
control message
Remote control message not
reached the indoor unit
Check remote control batteries,
if OK, check display and display
wiring, if OK, replace display
PCB. If still not OK replace
controller
3.
Indoor unit responds to remote cont
rol
message but Operate indicator (Green
LED) does not light up
Problem with display PCB
Replace display PCB. If still not
OK replace controller
4.
Indoor fan does not start (louvers are
opened and Green LED is ON)
Unit in heat mode and coil is
still not warm
Change to cool mode
Outdoor unit is in opposite
mode
Change operation mode
Problem with controller or
capacitor
Change to high speed and
Check power supply to motor is
higher than 130VAC (for triack
controlled motor) or higher than
220VAC for  xed speed motors,
if OK rep
lace capacitor, if not OK
replace controller
5.
Indoor fan works when unit is OFF, and
indoor fan speed is not changed by
remote control command.
Controller problem Replace controller
6. Water leakage from indoor unit
Indoor unit drainage tube is
blocked
Check and open drainage tube
7.
One indoor unit or more are operating
in cool mode with no capacity, and the
other units have water leaks/freezing
problems
The communication wires of
the indoor units are switched
Check and correct the
communication wires connection
8.
One ind
oor or more are operating in heat
mode with a limited capacity, and the coil
on the other units are very hot.
9. Outdoor unit display board and leds are off No power supply
Check the connections and the
wiring on the main
terminal - Repair if needed.