Soleus Air KFHHP-18, Manual

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Malfunction display section
When malfunction or protection occurs in the air conditioner, the indicators on outdoor main PCB will
blink ( for detail, see "Display and Meaning of Outdoor Indicator". When protection or malfunction is
eliminated, display will be back to normal
Sensor Malfunction
Handling method:
Check if the corresponding resistance of sensors( thermal resistor ) is normal ; plug well; the lead wire is not damage,
otherwise it is the sensor circuit or controller malfunction.
You can judge whether the sensor resistance is normal by measure the resistance or voltage and compare it with the
corresponding sensor resistance or voltage table
Overcurrent Protection
Possible reasons: the input voltage descend suddenly or the system overload.
Communicate Malfunction
Handling method:
Check if the communicate signal wire( indoor and outdoor connecting wire) is connected correctly and reliably.
System Abnormal
i.e. overload protection. When tube temperature (Check the temperature of outdoor heat exchanger when cooling and
check the temperature of indoor heat exchanger when heating) is too high,protection will be activated.
Possible reasons: the outdoor ambient temperature is too high when cooling, insufficient outdoor air circulation; and the
refrigerant flow malfunction.
Compressor Overload Protection
Possible reasons: the refrigerant is not enough or is too much; the capillary is blocked and the temperature rises; the
compressor does not run smoothly(seized or jammed); exhaust valve is breakage; the protector itself has malfunction.
(for detail, see " Compressor too hot, the stop often occur")
Handling method: adjust refrigerant amount; replace the capillary; replace the compressor; use the multimeter to check
whether the contactor of the compressor is fine when it is not overheated, if not, then replace the protector.
Exhaust Protection
Possible reasons: 1. exhaust sensor does not connect well; 2.exhaust sensor resistance is abnormal; 3.sensor circuit
malfunction;4.cooling system malfunction: shortage of refrigerant; blockage of air filter; poor ventilation or air flow short
pass for condenser; the system has noncondensing gas (such as air, water etc.); blockage of capillary assy (including
filter); leakage inside four-way valve causes incorrect operation; malfunction of compressor; malfunction of protection
relay; malfunction of discharge sensor; outdoor temperature too high.
Handling method:1.re-plugging the exhaust sensor; 2.replace the exhaust sensor ; 3. replace the circuit board; 4.repair
system .