TROUBLESHOOTING
12-2 SM HGFHHF 1-A.1 GB
12.1.3 Judgment by Indoor/Outdoor Unit Diagnostics
If the malfunction still exists 4min later after stop of unit due to compressor protection, error code will be
directly displayed though indoor display. In other situations, error code can be displayed by pressing
LIGHT button 6 times within 4s.
LEDs blinking
(0.5s ON and 0.5s OFF)
Fault description
2* 7
segments
RUN COOL HEAT
Possible Reason
No feedback of indoor motor H6 11
1. IFAN motor damaged
2. IFAN motor blocked
3. IDU PCB problem
Malfunction protection of
jumper cap
C5 15
Poor connection of the jumper on indoor
PCB.
Zero-crossing protection
(IDU)
U8 17
1. IFAN motor damaged
2. Zero-crossing circuit damaged on IDU
PCB
RAT failure F1 1
ICT failure F2 2
1. Sensor connection is not good
2. Senor was broken or damaged (Refer to
Sect 14 to check the sensor value)
3. PCB temperature detection circuit has
problem
12.2 Simple procedures for checking the Main Parts
12.2.1 Checking Mains Voltage.
Confirm that the Mains voltage is between 198 and 264 VAC. If Mains voltage is out of this
range, abnormal operation of the system is expected. If in range check the Power (Circuit)
Breaker and look for broken or loosed cable lugs or wiring mistake(s).
12.2.2 Checking Power Input.
If Indoor unit power LED is unlighted, power down the system and check the fuse of the Indoor
unit. If the fuse is OK replace the Indoor unit controller. If the fuse has blown, replace the fuse
and power up again.
12.2.3 Checking the Outdoor Fan Motor.
Run the unit in Cool/Heat/Dry mode (where the OFAN speed is high)
Check the voltage between two terminals( N and 5 ), normal voltage is 220-240VAC.
12.2.4 Checking the Compressor.
The compressor is rotary compressor with single-phase power input. It includes two
windings of main and auxiliary. Check the resistance of terminal R and C and resistance
of terminal S and C. If the windings is open or short, compressor should be replaced.
Pay attention, for the wiring connections, please refer to the wiring diagram and have
double confirmation before checking the compressor.
12.2.5 Checking the Reverse Valve (RV).
Running in heating mode, check the voltage between two terminals( N and 4 ), normal voltage
is 220-240VAC.
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