12-1
TROUBLESHOOTING
SM TQDCI 1-A.1 GB
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
No power supply
Check the connections and the
wiring on the main terminal -
Repair if needed.
PFC Chock coil
Check the PFC Chock coil
(12.4.3)
9.
Outdoor unit display board and leds are
off
Burnt fuse
Check 20A fuse on the Filter
(12.4.2)
EEV problem
Check EEV ( 12.4.7)
10.
Compressor operates but one or more
units generates no capacity
Refrigerant leakage
Check refrigeration system ( 12.2)
CONTENTS
