Airwell YSF Series, Service Manual

Page: 24 / 29

12-2
G N I T O O H S E L B U O R T
SM FSF048 1-A.0 GB
12.1.3 Judgment by Indoor Unit Diagnostics
The error code will be directly displayed through indoor display .
12.1.3.1 Unit Diagnostics and Corrective Actions
Indicator Failure Possible Reasons/Corrective actions
E1
High pressure
protection
• Refrigerant was superabundant
•
Poor heat exchange (including blockage and bad radiating
environment )
• Too high ambient temperature
E3
Low pressure
protection
• Refrigerant leakage
• Poor heat exchange (including blockage and bad radiating
environment )
• System is blocked
E4
Compressor
over heating
•
Refrigerant leakage
• Poor heat exchange
• Too high ambient temperature
E5 Over current
• Supply voltage is too low
•
Too high ambient temperature
• Poor heat exchange
F1 RAT failure
• Senor was broken or damaged
• PCB temperature detection circuit has problem
F2 ICT failure
F3 OAT failure
F4 OCT failure
F5 CTT failure
12.1.4 Checking the refrigeration system
The performance curves given in this manual are given when high indoor fan speed is
selected. Please refer to the performance curve to check the system pressure and other
thermodynamic measures.
12.2 Simple procedures for checking the Main Parts
12.2.1 Checking Mains Voltage.
Confirm that the Mains voltage is between 380VAC and 415 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.
Checking Power Input procedure for the Outdoor unit is the same as with the Indoor unit.
12.2.3 Checking the Outdoor Fan Motor.
Check the voltage between two pins( Hi and N ) of connector Controller OFAN, normal voltage
is 220~240VAC.
12.2.4 Checking the Compressor.
Three coil resistance is same. Check the resistance between three poles. The normal
value should be 3 ohm@25 ℃ .
12.2.5 Checking the Reverse Valve (RV).
Running in heating mode, check the voltage between two pins of reverse valve connector,
normal voltage is 220~240VAC.