Toshiba MMW-AP0481CHQ-E Service Manual

Also see for MMW-AP0481CHQ-E: Installation manual Manual

– 61 –Check codeLocationofdetectionDescription System status Check code detectioncondition(s) Check items (locations)MainremotecontrollerOutdoor 7-segment displayCheckcode Sub-codeP04 P04IPDU01: Compressor 1 side02: Compressor 2 sideActivation of high-pressure SWAll stop High-pressure SW isactivated.• Check connection of high pressureSW connector.• Check for trouble in PD pressuresensor.• Check outdoor service valves (gasside, liquid side) to confirm fullopening.• Check for trouble in outdoor fan.• Check for trouble in outdoor fanmotor.• Check outdoor PMVs (PMV1, 4)for clogging.• Check indoor/outdoor heatexchangers for clogging.• Check for short-circuiting ofoutdoor suction/discharge airflows.• Check SV2 circuit for clogging.• Check for trouble in outdoor P.C.board (I/F).• Check for trouble in indoor fansystem (possible cause of air flowreduction).• Check opening status of indoorPMV.• Check indoor-outdoorcommunication line for wiringtrouble.• Check for trouble operation ofcheck valve in discharge pipeconvergent section.• Check gas balancing SV4 valvecircuit.• Check SV5 valve circuit.• Check for refrigerant overcharging.P05 P05I/F00: Detection of openphase/phasesequence01: Compressor 1 side02: Compressor 2 sideInverter DCvoltage (Vdc)trouble(compressor)MG-CTT troubleAll stop • Open phase is detectedwhen power is turnedon.• Inverter DC voltage istoo high (overvoltage)or too low(undervoltage).• Check for trouble in outdoor P.C.board (I/F).• Check wiring of outdoor powersupply.P07 P07IPDUI/F01: Compressor 1 side02: Compressor 2 sideHeat sinkoverheatingtroubleAll stop Temperature sensor builtinto IPM (TH) isoverheated.• Check power supply voltage.• Check outdoor fan system trouble.• Check heat sink cooling duct forclogging.• Check IPM and heat sink forthermal performance for troubleinstallation.(e.g. mounting screws and thermalconductivity)• Check for trouble in A3-IPDU.(trouble IPM built-in temperaturesensor (TH))P10 P10Indoor unitDetected indooraddressIndoor overflowtroubleAll stop • Float switch operates.• Float switch circuit isopen-circuited ordisconnected atconnector.• Check float switch connector.• Check operation of drain pump.• Check drain pump circuit.• Check drain pipe for clogging.• Check for trouble in indoor P.C.board.P12 — —Indoor unitMG-CTT: Magnet contactorIndoor fan motortroubleStop ofcorrespondingunit• Motor speedmeasurementscontinuously deviatefrom target value.• Overcurrent protectionis activated.• Check connection of fan connectorand wiring.• Check for trouble in fan motor.• Check for trouble in indoor P.C.board.• Check impact of outside airtreatment (OA).