Airwell /yaz218, Service Manual

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TROUBLESHOOTING
SM YAZ218 1-A.2 GB
12-1
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
control message but Operate
indicator (Green LED) does not light
up
Problem with display
PCB
Replace display PCB.
If still not OK replace
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 opened and Green LED is ON)
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 fixed
speed motors, if OK replace
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
8.
One indoor or more are operating in
heat mode with a limited capacity,
and the coil on the other units are
very hot.
The communication
wires of the indoor units
are switched Check and correct the
communication wires
connection
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.
Check PFC choke connection