SERVICE MANUAL
R
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410A Ductless Split System: DLF4(A/H), DLC4(A/H)
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Analysis or processing of some of the malfunction display:
1 Compressor discharge protection
Possible causes: shortage of refrigerant; blockage of air filter; poor
ventilation or air flow short circuit of condenser; the system has
non
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condensing gas (such as air, water etc.); blockage of capillary
assy (including filter); malfunction of metering device; leakage in-
side four
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way valve causes incorrect operation; malfunction of
compressor; malfunction of protection relay; malfunction of dis-
charge sensor; outdoor temperature too high.
Processing method: refer to the malfunction analysis in the above
section.
2 Low voltage over
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current protection
Possible cause: Sudden drop of supply voltage.
3 Communication malfunction
Processing method: Check if communicating signal cable is con-
nected reliably.
4 Sensor open or short circuit
Processing method: check whether sensor is normal, connected
with the corresponding position on the controller and if damage of
lead wire is found.
5 Compressor over load protection
Possible causes: insufficient or too much refrigerant; blockage of
capillary or metering device and increase of suction temp.; improp-
er running of compressor, stuck bearing, damage of discharge
valve; malfunction of protector.
Processing method: adjust refrigerant amount; replace the capil-
lary or metering device; replace the compressor; use universal
meter to check if the contactor of compressor is fine when it is not
overheated, if not replace the protector.
6 System malfunction
i.e. overload protection. When tube temperature (check the tem-
perature of outdoor heat exchanger when cooling and check the
temperature of indoor heat exchanger when heating) is too high,
protection will be activated.
Possible causes: Outdoor temperature is too high when cooling; in-
sufficient outdoor air circulation; refrigerant flow malfunction.
Please refer to the malfunction analysis in the previous section for
handling method.
7 IPM Module protection
Precessing method: Once the module malfunction happens, if it
persists for a long time and cannot be self cancelled, cut off the
power and turn off the unit, and then re
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energize the unit again after
about 10 min. After repeating the procedure for several times, if the
malfunction still exists, replace the module.
