Specifications

Test Operation SiUS39-602
76 Test Operation
Malfunction code
In case of an alarm code displayed on remote controller:
1.1.4 Confirmation on Normal Operation
•
Conduct normal unit operation after the check operation has been completed.
(When outdoor air temperature is 75°F or higher, the unit can not be operated with heating
mode. See the instruction manual attached.)
Confirm that the indoor/outdoor units can be operated normally.
(When an abnormal noise due to liquid compression by the compressor can be heard, stop
the unit immediately, and turn on the crankcase heater to heat up it sufficiently, then start
operation again.)
•
Operate indoor unit one by one to check that the corresponding outdoor unit operates.
•
Confirm that the indoor unit discharges cold air (or warm air).
•
Operate the air direction control button and flow rate control button to check the function of
the devices.
Cause of trouble due to faulty
installation work
Alarm
code
Countermeasure
Closed stop valve of outdoor unit E3
E4
F3
UF
Liquid side stop valve : Open
Gas side stop valve : Open
Oil equalizing pipe stop valve : Close
Liquid side stop valve : Open
Gas side stop valve : Open
Oil equalizing pipe stop valve : Open
Reversed phase in power cable
connection for outdoor unit
U1 Change connection of two wires among three for correct phasing.
Electric power for outdoor or indoor unit
is not supplied. (Including open phase)
U4 Check that the power cable for outdoor unit is connected properly.
Incorrect wiring between units UF Check that the wiring between units corresponds correctly to
refrigerant piping system.
Refrigerant overcharge E3
F6
UF
Compute again optimum amount of refrigerant to be added based on
the piping length, then, collect the excessive amount by using
refrigerant collector to make the refrigerant amount proper.
Insufficient refrigerant E4
F3
- Check that additional charging has been carried out.
- Compute again the refrigerant amount to be added based on the
piping length, and charge proper amount of refrigerant additionally.