User manual MITSUBISHI MFZ-KA12NA

[. . . ] OUTLINES AND DIMENSIONS ·························7 MFZ-KA50VA - E1 5. WIRING DIAGRAM ············································8 6. REFRIGERANT SYSTEM DIAGRAM ················8 7. PERFORMANCE CURVES ································9 8. [. . . ] board. 2 Left lamp lights up Outdoor unit does not operate. Indoor coil thermistor 3 Room temperature thermistor Left lamp flashes. 2-time flash Indoor unit and outdoor unit do not operate. When the indoor coil or the room temperature thermistor is shorts or opens circuit. 2. 5-second OFF · Refer to 9-7. the characteristics of indoor coil thermistor, and the room temperature thermistor. 4 Indoor fan motor Left lamp flashes. 3-time flash Indoor unit and outdoor unit do not operate. When the rotational frequency feedback signal is not emitted during the indoor fan operation. · Refer to 9-6. A-1, A-2 "Check of indoor fan motor". 2. 5-second OFF Indoor control system Left lamp flashes. When it cannot properly read data in the nonvolatile memory of the indoor electronic control P. C. 6-time flash 7 Outdoor thermistors 2. 5-second OFF Outdoor control system Left lamp flashes. When it cannot properly read data in the nonvolatile memory of the inverter P. C. · Confirm the abnormality in detail using the failure mode recall function. The compressor stops 3 times consecutively for over current protection or start-up failure protection within 1 minute after start-up. Refer to service manual OC322, OB377 or OC316. 6 When the outdoor thermistors short or open circuit during the compressor operation. 8 2. 5-second OFF Left lamp flashes. 14-time flash 9 Other abnormality An abnormality other than above mentioned is detected. 10 Indoor damper 2. 5-second OFF Left lamp flashes. 15-time flash When the damper is not located at the designated position. · Refer to 9-6. E "Check of damper". 2. 5-second OFF NOTE : When the indoor unit has started operation and the above failures are detected (the first detection after the power ON), the indoor electronic control P. C. Yes (Unchanged) Replace the indoor fan motor. 27 When the left lamp of OPERATION INDICATOR lamp flashes 3 times and the right lamp of OPERATION INDICATOR lamp flashes ON and OFF every 0. 5-second. Check of indoor fan motor (lower) The indoor fan motor error has occurred, and the indoor fan doesn't operate. Turn OFF the power supply. Pay careful attention to the high voltage on the fan motor connector CN212. Turn ON the power supply, wait 5 seconds or more, and then press EMERGENCY OPERATION switch. Measure the supply voltage as follows within 12 seconds after EMERGENCY OPERATION switch is pressed. If more than 12 seconds passes by, turn OFF the power supply and turn ON it again, then measure the voltage. 2) Measure the voltage between CN212 5(+) and 3(-). Is there anything that interferes the rotation of the line flow fan? No Yes Remove the object and adjust the line flow fan. wIf more than 12 seconds passes after EMERGENCY OPERATION switch is pressed, the voltage mentioned in above 2) goes 0V DC although the indoor electronic control P. C. board is normal. Is there 311V DC between CN211 1 (+) and 3 (-), and does the voltage between CN212 5(+) and 3(-) rise to the range between 3 and 6VDC within 12 seconds after EMERGENCY OPERATION switch is pressed?No Yes Indoor electronic control P. C. Board Replace the indoor fan motor. Fuse (F11) JR05 JR06 VARISTOR (NR11) IC101 CN1X1 CN1Y1 R111 Replace the indoor electronic control P. C. board. C111T11 CN151 CN152 CN211 CN212 The indoor fan motor error has occurred, and the indoor fan repeats "12-second ON and 30-second OFF" 3 times, and then stops. Measure the voltage between CN212 6(+) and 3(-) while the fan motor is rotating. Is 0V DC or 15V DC held unchanged? [. . . ] (See Photo 9. ) (3) Remove the drain hose from the nozzle assembly (lower) and pull out the nozzle assembly (lower) toward you. (4) Remove the tape fixing the lead wires of the damper motor and the damper lock motor from the nozzle assembly <lower>. (See Photo 11 and 12. ) (6) Lift the nozzle slightly and remove the lock shaft from with in the nozzle and remove the damper lock motors (ML1, ML2). (7) Remove the screws of the damper motor support, and then the damper motor support. [. . . ]