12-1
TROUBLESHOOTING
SM TRIO52 1-A.2 GB
12. TROUBLESHOOTING
1 ELECTRICAL & CONTROL 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 3 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 1.6 below.
1.1 Dual Split System Failures and Corrective Actions
No
SYMPTOM PROBABLE
CAUSE CORRECTIVE
ACTION
1
Power supply indicator at
indoor unit (Red LED) does
not light up.
No power supply
Check power supply from the outdoor. If
power supply is OK, check display and
display wiring. If OK, replace controller.
Unit in heat mode and
coil is still not warm.
Change to cool mode and check.
The outdoor unit is in
the opposite mode.
Change operation mode and check if fan
starts.
2
Indoor fan does not start
(louvers are opened and
Green LED does light up)
Problem with PCB or
capacitor
Change to high speed and Check power
supply to motor is higher than 130VAC (for
Triac controlled motor) or higher than
220VAC for fixed speed motors, if OK
replace capacitor, if not OK replace controller
3
Compressor does not start
Jumper settings of
outdoor unit is not
correct
Use diagnostics information on MSMP board.
4
One indoor is operating, in
cool mode, with no capacity,
and the other unit has water
leaks/freezing problems
5
One indoor is operating in
heat mode with a limited
capacity, and the coil on the
other unit is very hot.
The communication
wires of the two indoor
units are switched
Check and correct the communication wires
connection
6
Compressor operate but unit
generate no capacity
EEV is stuck in close
position
Check EEV
7
One unit only is operating
Communication
problems
Use diagnostics information on MSMP board.
8
All others
Specific problems of
indoor or outdoor units
Use diagnostics information on MSMP board,
and perform action items as recommended in
single split systems
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