Super Multi System - Toshiba

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56 Troubleshooting Diagnostic procedure for check code Check code Operation cause [A7] 1. Outdoor unit service valve closed. Suction temperature (TS) alarm (>40°C) 2. Blockage PMV assembly on the liquid line. 3. TS pressure switch error. 4. Insufficient refrigerant, blockage in pipe. Are the gas pipe and liquid pipe service valves of the outdoor unit fully open ? � Is there a blockage in the expansion valve on the liquid line? � Yes No Are the characteristics of TS pressure switch normal? (N/C type) Yes � Insufficient refrigerant, blockage, pipe breakage. No Yes No Check code [AA] Operation cause High pressure sensor (Pd) short circuit Pd sensor output voltage alarm � � � Open valves fully. Replace expansion valve. Replace TS pressure switch. If there is an abnormal output voltage of Pd sensor: Check connector circuit (Pd sensor: PJ7) and output voltage of the sensor. If the sensor is normal, replace the outdoor interface PC board. Sensor characteristics: Input 12 V DC (± 10%) across red and black leads of the pressure sensor. Output 0.5 to 4.5 V at 0 to 2.45 MPa across white and black leads of the pressure sensor.
Troubleshooting Diagnostic procedure for check code Check code Operation cause [Ad] 1. Fixed-speed compressor high pressure SW error. Fixed-speed compressor fault 2. Fixed-speed compressor IOL operation. 3. Service valve closed. 4. Outdoor fan, capacitor error. 5. <strong>Multi</strong> Controller/outdoor PMV blockage. 6. Outdoor heat exchanger blockage. 7. SV2 circuit blockage. 8. Miswiring of communicaiton between indoor and outdoor unit. 9. Pd sensor error. 10.Refrigerant overcharge. OCR: Overload Current Relay Does the fixed-speed high pressure switch operate? � Are the fixed-speed high pressure switch parts normal? � Is service valve fully open? � Does the outdoor fan normally operate? � Is there a problem with the outdoor unit heat exchanger? (1) Blockage of heat exchanger (2) Short circuit (air flow) (3) Blockage of air flow � C Yes Yes Yes Yes No No � Check parts. If defective, replace. Open service valve fully. No Yes � No No No � Repair failed position. � No Replace high pressure sensor. � Remove cause. � Are the connection, capacitor and fan motor normal? � Are the high pressure sensor characteristics normal? � Yes Yes No � See judgment flow of fixed-speed IOL, OL circuits “E6”. No � Reset relay. Check compressor withstand resistance. � No Check and modify wiring Check outdoor interface PC board. If defective replace board. � Is the fixed-speed IOL circuit normal? �� Is circuit wiring normal? � Yes Is the fixed-speed OCR circuit normal? � Yes Yes 57
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Super Multi System HFC R407C A90-02
Page 4 and 5:
4 Introduction Precautions Please r
Page 6 and 7: Components - 3 pipe system 1. Outdo
Page 8 and 9: 8 Introduction Super multi system b
Page 10 and 11: 10 Introduction Components Setting
Page 12 and 13: 12 Parts specification Outdoor unit
Page 14 and 15: 14 Parts specification Outdoor unit
Page 16 and 17: MAR-F105HTM8-PE Dimensional drawing
Page 18 and 19: MAR-F105HTM8-PE 18 Wiring diagrams
Page 20 and 21: 20 Wiring diagram Multi Controllers
Page 22 and 23: 22 Refrigeration piping schematic d
Page 24 and 25: 24 Refrigeration piping schematic d
Page 26 and 27: 26 Diagnostic procedure Outdoor uni
Page 28 and 29: 28 Diagnostic procedure Outdoor uni
Page 30 and 31: 9. Outdoor unit - pressure sensor d
Page 32 and 33: 32 Diagnostic procedure Multi Contr
Page 34 and 35: 34 Fault code display Self-diagnost
Page 36 and 37: 04 No communication signal between
Page 38 and 39: 38 Is 4-way valve coil connector co
Page 40 and 41: 40 Is drain pump connected? Does fl
Page 42 and 43: 42 Troubleshooting Diagnostic proce
Page 44 and 45: Check code Status of air conditione
Page 46 and 47: Check code Operation cause [21] 1.
Page 48 and 49: Check code Operation cause [E5] 1.
Page 54 and 55: Check code [A0] Operation cause Dis
Page 58 and 59: 58 C � Does heating indoor fan op
Page 64 and 65: 64 Control features Outdoor unit/Mu
Page 66 and 67: 66 Valve and sensor function and op
Page 68 and 69: 68 Valve and sensor function and op
Page 70 and 71: Leak position check 70 Refrigerant
Page 72 and 73: Additional refrigerant One Multi Co
Page 74 and 75: 74 Exploded view and service parts
Page 80: www.toshiba-aircon.co.uk MADE IN UK
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Super Multi System - Toshiba

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