Symptom-based Troubleshooting SiUS34-801A_b318 Troubleshooting1. Symptom-based TroubleshootingSymptom Probable Cause Countermeasure1 System does not start operation at all. Blowout of fuse(s) Turn Off the power supply and thenreplace the fuse(s).Cutout of breaker(s) • If the knob of any breaker is in itsOFF position, turn ON the powersupply.• If the knob of any circuit breakeris in its tripped position, do notturn ON the power supply.Power failure After the power failure is reset,restart the system.2 System starts operation but makes an immediatestop. Blocked air inlet or outlet of indooror outdoor unit Remove obstacle(s).Clogged air filter(s) Clean the air filter(s).3 System does not cool or heat air well. Blocked air inlet or outlet of indooror outdoor unit Remove obstacle(s).Clogged air filter(s) Clean the air filter(s).Enclosed outdoor unit(s) Remove the enclosure.Improper set temperature Set the temperature to a properdegree.Airflow rate set to LOW Set it to a proper airflow rate.Improper direction of air diffusion Set it to a proper direction.Open window(s) or door(s) Shut it tightly.[In cooling] Direct sunlight received Hang curtains or shades onwindows.[In cooling] Too many persons staying in aroom[In cooling] Too many heat sources (e.g. OAequipment) located in a room4 System does notoperate. The system stops andimmediately restartsoperation.If the OPERATION lamp on theremote controller turns ON, thesystem will be normal. Thesesymptoms indicate that the systemis controlled so as not to putunreasonable loads on the system.Normal operation. The system willautomatically start operation after alapse of five minutes.Pressing the TEMP ADJUSTbutton immediately resets thesystem.The remote controller displaysUNDER CENTRALIZEDCONTROL, which blinks for aperiod of several secondswhen the OPERATION buttonis depressed.The system is controlled withcentralized controller. Blinkingdisplay indicates that the systemcannot be operated using theremote controller.Operate the system using theCOOL/HEAT centralized remotecontroller.The system stops immediatelyafter turning ON the powersupply.The system is in preparation modeof micro computer operation. Wait for a period of approximatelyone minute.5 System makesintermittentstops.The remote controller displaysmalfunction codes [U4] and[U5], and the system stops butrestarts after a lapse ofseveral minutes.The system stops due to aninterruption in communicationbetween units caused by electricalnoises coming from equipmentother than air conditioners.Remove causes of electrical noises.If these causes are removed, thesystem will automatically restartoperation.ONOFFKnobTrippedCircuit breaker
